chore(deps): 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/docker.build.yml

@@ -11,7 +11,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
       - name: Docker meta
         id: docker_meta
         uses: crazy-max/ghaction-docker-meta@v5.7.0
@@ -57,13 +57,13 @@ jobs:
           labels: ${{ steps.docker_meta.outputs.labels }}
       - name: Check out `wmde/wbaas-deploy` repository in staging child directory
         if: github.event_name != 'pull_request'
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
         with:
           repository: wmde/wbaas-deploy
           path: ./repos/wbaas-deploy-staging
       - name: Check out `wmde/wbaas-deploy` repository in production child directory
         if: github.event_name != 'pull_request'
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
         with:
           repository: wmde/wbaas-deploy
           path: ./repos/wbaas-deploy-production

.github/workflows/github.prs.combine.yml

@@ -93,7 +93,7 @@ jobs:
             console.log('Combined: ' + combined);
             return combined
       # Checks-out your repository under $GITHUB_WORKSPACE, so your job can access it
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
         with:
           fetch-depth: 0
           token: ${{ secrets.GH_TOKEN_PLUSW }}