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

Author: renovate[bot]

.github/workflows/docker.yaml

@@ -38,7 +38,7 @@ jobs:
           username: ${{ github.repository_owner }}
           password: ${{ secrets.GITHUB_TOKEN }}
 
-      - uses: docker/metadata-action@v5
+      - uses: docker/metadata-action@v6
         id: meta
         with:
           images: |