Bump actions/checkout from 5 to 6 (#9288)

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

.github/workflows/build-linux.yml

@@ -49,7 +49,7 @@ jobs:
                            libc6 libgcc-s1 libstdc++6 zlib1g libicu-dev libssl-dev
 
     - name: Checkout repo (for scripts)
-      uses: actions/checkout@v6.0.2
+      uses: actions/checkout@v6
       with:
         submodules: 'recursive'
         fetch-depth: '0'
@@ -151,7 +151,7 @@ jobs:
         dnf repolist | grep -i epel || true
 
     - name: Checkout repo (for scripts)
-      uses: actions/checkout@v6.0.2
+      uses: actions/checkout@v6
       with:
         submodules: 'recursive'
         fetch-depth: '0'