ci: bump docker/metadata-action from 3.3.0 to 4.5.0

Bumps [docker/metadata-action](https://github.com/docker/metadata-action) from 3.3.0 to 4.5.0.
- [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@98669ae...2c0bd77)

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

Signed-off-by: dependabot[bot] <support@github.com>

.github/workflows/push-to-registry.yaml

@@ -21,7 +21,7 @@ jobs:
 
       - name: Extract metadata for Docker
         id: meta
-        uses: docker/metadata-action@98669ae865ea3cffbcbaa878cf57c20bbf1c6c38
+        uses: docker/metadata-action@2c0bd771b40637d97bf205cbccdd294a32112176
         with:
           images: lucaspolo/redditbot