Bump docker/metadata-action from 3.6.0 to 3.6.1

Bumps [docker/metadata-action](https://github.com/docker/metadata-action) from 3.6.0 to 3.6.1.
- [Release notes](https://github.com/docker/metadata-action/releases)
- [Commits](548e2346a9...a2e02890a0)

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

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

.github/workflows/docker.yml

@@ -37,7 +37,7 @@ jobs:
       # https://github.com/docker/metadata-action
       - name: Extract Docker metadata
         id: meta
-        uses: docker/metadata-action@548e2346a9987b56d8a4104fe776321ff8e23440
+        uses: docker/metadata-action@a2e02890a0d28163b34ac2e4b575b9264a5ee3e2
         with:
           images: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}
           flavor: latest=${{ github.ref == 'refs/heads/master' }}