Bump actions/checkout from 5 to 6 (#19686)

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/ci-build.yml

@@ -27,11 +27,11 @@ jobs:
     steps:
       - name: Checkout
         if: github.head_ref == ''
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
 
       - name: Checkout merge
         if: github.head_ref != ''
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
         with:
           ref: refs/pull/${{github.event.pull_request.number}}/merge
 

.github/workflows/rebuild.yml

@@ -51,13 +51,13 @@ jobs:
 
     - name: Checkout
       if: ${{ github.head_ref == '' && env.LABEL == 'rebuild' }}
-      uses: actions/checkout@v5
+      uses: actions/checkout@v6
       with:
         persist-credentials: false
 
     - name: Checkout merge
       if: ${{ github.head_ref != '' && env.LABEL == 'rebuild' }}
-      uses: actions/checkout@v5
+      uses: actions/checkout@v6
       with:
         ref: refs/pull/${{github.event.pull_request.number}}/merge
         persist-credentials: false