Upgrade GitHub Actions for Node 24 compatibility (#335)

## Summary

Upgrade GitHub Actions to their latest versions to ensure compatibility
with Node 24, as Node 20 will reach end-of-life in April 2026.

## Changes

| Action | Old Version(s) | New Version | Release | Files |
|--------|---------------|-------------|---------|-------|
| `actions/cache` |
[`v4`](https://github.com/actions/cache/releases/tag/v4) |
[`v5`](https://github.com/actions/cache/releases/tag/v5) |
[Release](https://github.com/actions/cache/releases/tag/v5) |
build_kernel_windows.yaml, rust.yaml |
| `actions/checkout` |
[`v4`](https://github.com/actions/checkout/releases/tag/v4),
[`v5`](https://github.com/actions/checkout/releases/tag/v5) |
[`v6`](https://github.com/actions/checkout/releases/tag/v6) |
[Release](https://github.com/actions/checkout/releases/tag/v6) |
build_kernel.yaml, build_kernel_macos.yaml, build_kernel_rocm.yaml,
build_kernel_windows.yaml, build_kernel_xpu.yaml, check_variants.yaml,
docker-build-push.yaml, kernel_abi_python_release.yaml, nix_fmt.yaml,
rust.yaml, test_extra_commands.yaml, test_python.yaml |
| `actions/download-artifact` |
[`v4`](https://github.com/actions/download-artifact/releases/tag/v4) |
[`v7`](https://github.com/actions/download-artifact/releases/tag/v7) |
[Release](https://github.com/actions/download-artifact/releases/tag/v7)
| build_kernel.yaml, kernel_abi_python_release.yaml |
| `actions/setup-python` |
[`v5`](https://github.com/actions/setup-python/releases/tag/v5) |
[`v6`](https://github.com/actions/setup-python/releases/tag/v6) |
[Release](https://github.com/actions/setup-python/releases/tag/v6) |
kernel_abi_python_release.yaml |
| `actions/upload-artifact` |
[`v4`](https://github.com/actions/upload-artifact/releases/tag/v4) |
[`v6`](https://github.com/actions/upload-artifact/releases/tag/v6) |
[Release](https://github.com/actions/upload-artifact/releases/tag/v6) |
build_kernel.yaml, kernel_abi_python_release.yaml |

## Context

Per [GitHub's
announcement](https://github.blog/changelog/2025-09-19-deprecation-of-node-20-on-github-actions-runners/),
Node 20 is being deprecated and runners will begin using Node 24 by
default starting March 4th, 2026.

### Why this matters

- **Node 20 EOL**: April 2026
- **Node 24 default**: March 4th, 2026
- **Action**: Update to latest action versions that support Node 24

### Security Note

Actions that were previously pinned to commit SHAs remain pinned to SHAs
(updated to the latest release SHA) to maintain the security benefits of
immutable references.

### Testing

These changes only affect CI/CD workflow configurations and should not
impact application functionality. The workflows should be tested by
running them on a branch before merging.

Signed-off-by: Salman Muin Kayser Chishti <13schishti@gmail.com>

Author: salmanmkc

.github/workflows/build_kernel.yaml

@@ -13,7 +13,7 @@ jobs:
     runs-on:
       group: aws-highmemory-32-plus-nix
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
       - uses: DeterminateSystems/nix-installer-action@main
         with:
           extra-conf: |
@@ -64,7 +64,7 @@ jobs:
         run: cp -rL examples/silu-and-mul/result silu-and-mul-kernel
 
       - name: Upload kernel artifacts
-        uses: actions/upload-artifact@v4
+        uses: actions/upload-artifact@v6
         with:
           name: built-kernels
           path: |
@@ -81,10 +81,10 @@ jobs:
     runs-on:
       group: aws-g6-12xlarge-plus
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
 
       - name: Download kernel artifacts
-        uses: actions/download-artifact@v4
+        uses: actions/download-artifact@v7
         with:
           name: built-kernels
           path: .

.github/workflows/build_kernel_macos.yaml

@@ -16,7 +16,7 @@ jobs:
         run: sudo xcrun xcode-select -s /Applications/Xcode_26.0.app
       - name: "Install Metal Toolchain"
         run: xcodebuild -downloadComponent metalToolchain
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
       - uses: cachix/install-nix-action@v31
       - uses: cachix/cachix-action@v15
         with:

.github/workflows/build_kernel_rocm.yaml

@@ -13,7 +13,7 @@ jobs:
     runs-on:
       group: aws-highmemory-32-plus-nix
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
       - uses: DeterminateSystems/nix-installer-action@main
         with:
           extra-conf: |

.github/workflows/build_kernel_windows.yaml

@@ -23,15 +23,15 @@ jobs:
     runs-on: ${{ matrix.os }}
 
     steps:
-      - uses: actions/cache@v4
+      - uses: actions/cache@v5
         with:
           key: cuda-toolkit-v${{ matrix.cuda }}-${{ matrix.os }}
           path: |
             C:\Program Files\NVIDIA GPU Computing Toolkit
             ~/.cargo/registry
             ~/.cargo/git
 
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
 
       # CUDA environment setup
       - uses: Jimver/cuda-toolkit@v0.2.29

.github/workflows/build_kernel_xpu.yaml

@@ -13,7 +13,7 @@ jobs:
     runs-on:
       group: aws-highmemory-32-plus-nix
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
       - uses: DeterminateSystems/nix-installer-action@main
         with:
           extra-conf: |

.github/workflows/check_variants.yaml

@@ -12,7 +12,7 @@ jobs:
     name: Check build variants
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
       - uses: cachix/install-nix-action@v27
         with:
           nix_path: nixpkgs=channel:nixos-unstable

.github/workflows/docker-build-push.yaml

@@ -25,7 +25,7 @@ jobs:
 
     steps:
       - name: Checkout repository
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
 
       - name: Set up QEMU
         uses: docker/setup-qemu-action@v3
@@ -76,7 +76,7 @@ jobs:
 
     steps:
       - name: Checkout repository
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
 
       - name: Set up QEMU
         uses: docker/setup-qemu-action@v3

.github/workflows/kernel_abi_python_release.yaml

@@ -37,8 +37,8 @@ jobs:
           - runner: ubuntu-22.04
             target: ppc64le
     steps:
-      - uses: actions/checkout@v4
-      - uses: actions/setup-python@v5
+      - uses: actions/checkout@v6
+      - uses: actions/setup-python@v6
         with:
           python-version: 3.x
       - name: Build wheels
@@ -56,7 +56,7 @@ jobs:
           sccache: ${{ !startsWith(github.ref, 'refs/tags/') }}
           manylinux: auto
       - name: Upload wheels
-        uses: actions/upload-artifact@v4
+        uses: actions/upload-artifact@v6
         with:
           name: wheels-linux-${{ matrix.platform.target }}
           path: dist
@@ -75,8 +75,8 @@ jobs:
           - runner: ubuntu-22.04
             target: armv7
     steps:
-      - uses: actions/checkout@v4
-      - uses: actions/setup-python@v5
+      - uses: actions/checkout@v6
+      - uses: actions/setup-python@v6
         with:
           python-version: 3.x
       - name: Build wheels
@@ -94,7 +94,7 @@ jobs:
           sccache: ${{ !startsWith(github.ref, 'refs/tags/') }}
           manylinux: musllinux_1_2
       - name: Upload wheels
-        uses: actions/upload-artifact@v4
+        uses: actions/upload-artifact@v6
         with:
           name: wheels-musllinux-${{ matrix.platform.target }}
           path: dist
@@ -109,8 +109,8 @@ jobs:
           - runner: windows-latest
             target: x86
     steps:
-      - uses: actions/checkout@v4
-      - uses: actions/setup-python@v5
+      - uses: actions/checkout@v6
+      - uses: actions/setup-python@v6
         with:
           python-version: 3.x
           architecture: ${{ matrix.platform.target }}
@@ -120,7 +120,7 @@ jobs:
           target: ${{ matrix.platform.target }}
           args: --release --out dist --manifest-path kernel-abi-check/bindings/python/Cargo.toml
           sccache: ${{ !startsWith(github.ref, 'refs/tags/') }}
-      - uses: actions/setup-python@v5
+      - uses: actions/setup-python@v6
         with:
           python-version: 3.13t
           architecture: ${{ matrix.platform.target }}
@@ -131,7 +131,7 @@ jobs:
           args: --release --out dist --manifest-path kernel-abi-check/bindings/python/Cargo.toml -i python3.13t
           sccache: ${{ !startsWith(github.ref, 'refs/tags/') }}
       - name: Upload wheels
-        uses: actions/upload-artifact@v4
+        uses: actions/upload-artifact@v6
         with:
           name: wheels-windows-${{ matrix.platform.target }}
           path: dist
@@ -144,8 +144,8 @@ jobs:
           - runner: macos-14
             target: aarch64
     steps:
-      - uses: actions/checkout@v4
-      - uses: actions/setup-python@v5
+      - uses: actions/checkout@v6
+      - uses: actions/setup-python@v6
         with:
           python-version: 3.x
       - name: Build wheels
@@ -161,22 +161,22 @@ jobs:
           args: --release --out dist --manifest-path kernel-abi-check/bindings/python/Cargo.toml -i python3.13t
           sccache: ${{ !startsWith(github.ref, 'refs/tags/') }}
       - name: Upload wheels
-        uses: actions/upload-artifact@v4
+        uses: actions/upload-artifact@v6
         with:
           name: wheels-macos-${{ matrix.platform.target }}
           path: dist
 
   sdist:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
       - name: Build sdist
         uses: PyO3/maturin-action@v1
         with:
           command: sdist
           args: --out dist --manifest-path kernel-abi-check/bindings/python/Cargo.toml
       - name: Upload sdist
-        uses: actions/upload-artifact@v4
+        uses: actions/upload-artifact@v6
         with:
           name: wheels-sdist
           path: dist
@@ -197,7 +197,7 @@ jobs:
       # Used to generate artifact attestation
       attestations: write
     steps:
-      - uses: actions/download-artifact@v4
+      - uses: actions/download-artifact@v7
       - name: Generate artifact attestation
         uses: actions/attest-build-provenance@v2
         with:

.github/workflows/nix_fmt.yaml

@@ -12,7 +12,7 @@ jobs:
     name: Nix checks
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
       - uses: cachix/install-nix-action@v27
         with:
           nix_path: nixpkgs=channel:nixos-unstable

.github/workflows/rust.yaml

@@ -7,7 +7,7 @@ jobs:
     name: Rustfmt
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
       - uses: dtolnay/rust-toolchain@stable
         with:
           components: rustfmt
@@ -22,8 +22,8 @@ jobs:
     name: Clippy
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
-      - uses: actions/cache@v4
+      - uses: actions/checkout@v6
+      - uses: actions/cache@v5
         with:
           path: |
             ~/.cargo/bin/