Bump docker/metadata-action from 3.8.0 to 4.0.1 (#539)

Bumps [docker/metadata-action](https://github.com/docker/metadata-action) from 3.8.0 to 4.0.1.
- [Release notes](https://github.com/docker/metadata-action/releases)
- [Upgrade guide](https://github.com/docker/metadata-action/blob/master/UPGRADE.md)
- [Commits](https://github.com/docker/metadata-action/compare/v3.8.0...v4.0.1)

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

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.github/workflows/prod-deploy.yml

@@ -52,7 +52,7 @@ jobs:
           password: ${{ secrets.DOCKER_PASSWORD }}
       - name: Extract metadata (tags, labels) for Docker
         id: meta
-        uses: docker/metadata-action@v3.8.0
+        uses: docker/metadata-action@v4.0.1
         with:
           images: ajbura/cinny
       - name: Build and push Docker image