chore(deps): update docker/metadata-action action to v6

Author: renovate[bot]

.github/workflows/docker.yml

@@ -27,7 +27,7 @@ jobs:
 
       - name: Extract metadata (tags, labels) for Docker
         id: meta
-        uses: docker/metadata-action@v5
+        uses: docker/metadata-action@v6
         with:
           images: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}
           # The tag will be created by the publish.yml action