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](https://github.com/actions/checkout/compare/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>

.github/workflows/build.yml

@@ -20,7 +20,7 @@ jobs:
           - release
     steps:
       - name: Check out files
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
         with:
           submodules: true
           fetch-depth: 0
@@ -49,7 +49,7 @@ jobs:
         run: cmake --build --preset=${{matrix.configuration}}
 
       - name: Upload ${{matrix.configuration}} binaries
-        uses: actions/upload-artifact@v4
+        uses: actions/upload-artifact@v5
         with:
           name: ${{matrix.configuration}} binaries
           path: |