Bump docker/metadata-action from 5 to 6 (#8757)

Bumps [docker/metadata-action](https://github.com/docker/metadata-action) from 5 to 6.
- [Release notes](https://github.com/docker/metadata-action/releases)
- [Commits](https://github.com/docker/metadata-action/compare/v5...v6)

---
updated-dependencies:
- dependency-name: docker/metadata-action
  dependency-version: '6'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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.github/workflows/docker-publish.yml

@@ -56,7 +56,7 @@ jobs:
 
     - name: Add metadata to Docker images
       id: meta
-      uses: docker/metadata-action@v5
+      uses: docker/metadata-action@v6
       with:
         flavor: ${{ matrix.flavor }}
         images: |