Bump actions/checkout from 5 to 6

Bumps [actions/checkout](https://github.com/actions/checkout) from 5 to 6.
- [Release notes](https://github.com/actions/checkout/releases)
- [Changelog](https://github.com/actions/checkout/blob/main/CHANGELOG.md)
- [Commits](actions/checkout@v5...v6)

---
updated-dependencies:
- dependency-name: actions/checkout
  dependency-version: '6'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

.github/workflows/binaries.yml

@@ -29,7 +29,7 @@ jobs:
     name: Build ${{ matrix.attr }} binary on ${{ matrix.system }}
     runs-on: ${{ matrix.os }}
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - uses: cachix/install-nix-action@v31
         with:
           extra_nix_config: |
@@ -58,7 +58,7 @@ jobs:
     name: Build Windows binary
     runs-on: windows-latest
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - uses: haskell-actions/setup@v2
         with:
           ghc-version: '9.10'

.github/workflows/ci.yml

@@ -16,7 +16,7 @@ jobs:
     name: Build and test on ${{ matrix.ghc }}
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - uses: cachix/install-nix-action@v31
         with:
           extra_nix_config: |
@@ -33,7 +33,7 @@ jobs:
     name: Formatting and linting
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - uses: cachix/install-nix-action@v31
         with:
           extra_nix_config: |
@@ -53,7 +53,7 @@ jobs:
       NETLIFY_AUTH_TOKEN: ${{ secrets.NETLIFY_AUTH_TOKEN }}
       NETLIFY_SITE_ID: ${{ secrets.NETLIFY_SITE_ID }}
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - uses: cachix/install-nix-action@v31
         with:
           extra_nix_config: |
@@ -93,7 +93,7 @@ jobs:
     name: Build and test via Stack
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - uses: haskell-actions/setup@v2
         with:
           enable-stack: true