Bump docker/metadata-action from 5 to 6

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

---
updated-dependencies:
- dependency-name: docker/metadata-action
  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.yml

@@ -28,7 +28,7 @@ jobs:
 
             - name: '[docker] Docker meta'
               id: meta-test
-              uses: docker/metadata-action@v5
+              uses: docker/metadata-action@v6
               with:
                 images: |
                   ${{ env.PUBLIC_IMAGE_PREFIX }}/${{ env.DOCKER_IMAGE_NAME }}
@@ -55,7 +55,7 @@ jobs:
             - name: '[docker-hub] Docker meta'
               id: meta-public
               if: github.event_name != 'pull_request' && github.actor != 'dependabot[bot]'
-              uses: docker/metadata-action@v5
+              uses: docker/metadata-action@v6
               with:
                 images: |
                   ${{ env.PUBLIC_IMAGE_PREFIX }}/${{ env.DOCKER_IMAGE_NAME }}