Bump actions/checkout from 4 to 5 (#206)

Bumps [actions/checkout](https://github.com/actions/checkout) from 4 to 5.
- [Release notes](https://github.com/actions/checkout/releases)
- [Changelog](https://github.com/actions/checkout/blob/main/CHANGELOG.md)
- [Commits](actions/checkout@v4...v5)

---
updated-dependencies:
- dependency-name: actions/checkout
  dependency-version: '5'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

.github/workflows/ci.yaml

@@ -12,7 +12,7 @@ jobs:
     name: Rustfmt
     runs-on: ubuntu-24.04
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v5
       - name: Cache cargo
         uses: Swatinem/rust-cache@v2
       - uses: IronCoreLabs/rust-toolchain@v1
@@ -50,7 +50,7 @@ jobs:
           - os: windows-2025
             target: x86_64-pc-windows-msvc
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v5
       - name: Cache cargo
         uses: Swatinem/rust-cache@v2
       - uses: IronCoreLabs/rust-toolchain@v1
@@ -75,7 +75,7 @@ jobs:
           - 1.85.0 #MSRV
       fail-fast: false
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v5
       - name: Cache cargo
         uses: Swatinem/rust-cache@v2
       - uses: IronCoreLabs/rust-toolchain@v1
@@ -98,7 +98,7 @@ jobs:
           - name: base
             ref: ${{ github.base_ref }}
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v5
         with:
           ref: ${{ matrix.ref }}
       - name: Cache cargo
@@ -128,7 +128,7 @@ jobs:
     name: Upload benchmark results
     runs-on: ubuntu-24.04
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v5
       - name: Cache cargo
         uses: Swatinem/rust-cache@v2
       - name: Retrieve benchmark results