Bump actions/checkout from 4 to 6

Bumps [actions/checkout](https://github.com/actions/checkout) from 4 to 6.
- [Release notes](https://github.com/actions/checkout/releases)
- [Changelog](https://github.com/actions/checkout/blob/main/CHANGELOG.md)
- [Commits](actions/checkout@v4...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>

Author: dependabot[bot]

.github/workflows/Test.yaml

@@ -11,7 +11,7 @@ jobs:
     name: Unit Tests - PHP
     runs-on: self-hosted
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
       - name: Setup PHP
         uses: shivammathur/setup-php@v2
         env:

.github/workflows/build-cli.yaml

@@ -18,7 +18,7 @@ jobs:
     outputs:
       image: ${{ steps.meta.outputs.tags }}
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
       - name: Login to GitHub Container Registry
         uses: docker/login-action@v3
         with:
@@ -95,7 +95,7 @@ jobs:
     env:
       DPHP_HOST: http://dphp:8080
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
       - run: |
           composer install --ignore-platform-reqs
       - run: |