⬆️ Bump docker/metadata-action from 3 to 4 (#237)

Bumps [docker/metadata-action](https://github.com/docker/metadata-action) from 3 to 4.
- [Release notes](https://github.com/docker/metadata-action/releases)
- [Upgrade guide](https://github.com/docker/metadata-action/blob/master/UPGRADE.md)
- [Commits](docker/metadata-action@v3...v4)

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

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.github/workflows/docker.yml

@@ -16,7 +16,7 @@ jobs:
 
       - name: Docker meta
         id: docker_meta
-        uses: docker/metadata-action@v3
+        uses: docker/metadata-action@v4
         with:
           images: templum/rabbitmq-connector, ghcr.io/templum/rabbitmq-connector
           labels: |