build(deps): bump docker/metadata-action from 5.5.1 to 6.1.0 (#527)

Bumps [docker/metadata-action](https://github.com/docker/metadata-action) from 5.5.1 to 6.1.0.
- [Release notes](https://github.com/docker/metadata-action/releases)
- [Commits](docker/metadata-action@8e5442c...80c7e94)

---
updated-dependencies:
- dependency-name: docker/metadata-action
  dependency-version: 6.0.0
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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Author: dependabot[bot]

.github/workflows/container.yml

@@ -25,7 +25,7 @@ jobs:
           password: ${{ secrets.GITHUB_TOKEN }}
 
       - name: Generate Container Metadata
-        uses: docker/metadata-action@8e5442c4ef9f78752691e2d8f8d19755c6f78e81
+        uses: docker/metadata-action@80c7e94dd9b9319bd5eb7a0e0fe9291e23a2a2e9
         id: metadata
         with:
           images: ghcr.io/spack/tutorial