Merge pull request #716 from writefreely/dependabot/github_actions/docker/metadata-action-4.6.0

Bump docker/metadata-action from 4.1.1 to 4.6.0

.github/workflows/docker-publish.yml

@@ -44,7 +44,7 @@ jobs:
       # https://github.com/docker/metadata-action
       - name: Extract Docker metadata
         id: meta
-        uses: docker/metadata-action@v4.1.1
+        uses: docker/metadata-action@v4.6.0
         with:
           images: |
             ghcr.io/${{ github.repository }}