Bump actions/checkout from 5 to 6 (#1966)

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

Author: dependabot[bot]

.github/workflows/build.yml

@@ -26,7 +26,7 @@ jobs:
     if: ${{ needs.pre_job.outputs.should_skip != 'true' }}
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
         name: Checkout repository
 
       - name: Setup PHP
@@ -71,7 +71,7 @@ jobs:
     name: PHP ${{ matrix.php }} on ${{ matrix.operating-system }} with ${{ matrix.dependencies }} dependencies
 
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
         name: Checkout repository
 
       - name: Setup PHP
@@ -108,7 +108,7 @@ jobs:
       - test
     if: ${{ needs.pre_job.outputs.should_skip != 'true' }}
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
         name: Checkout repository
 
       - name: Setup PHP
@@ -147,7 +147,7 @@ jobs:
     if: ${{ needs.pre_job.outputs.should_skip != 'true' }}
     steps:
       - name: Checkout repository
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
         with:
           fetch-depth: 10
 
@@ -206,7 +206,7 @@ jobs:
       - test
     steps:
       - name: Checkout repository
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
 
       - name: Build & upload image
         uses: elgohr/Publish-Docker-Github-Action@v5

.github/workflows/subtree-split.yml

@@ -96,7 +96,7 @@ jobs:
             split_repository: 'task-zendserverdeploymenttool'
 
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
 
       # no tag
       -