Bump docker/metadata-action from 5.10.0 to 6.0.0

Bumps [docker/metadata-action](https://github.com/docker/metadata-action) from 5.10.0 to 6.0.0.
- [Release notes](https://github.com/docker/metadata-action/releases)
- [Commits](docker/metadata-action@c299e40...030e881)

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

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

Author: dependabot[bot]

.github/workflows/release.yaml

@@ -45,7 +45,7 @@ jobs:
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
       - name: Generate images meta
         id: meta
-        uses: docker/metadata-action@c299e40c65443455700f0fdfc63efafe5b349051 #v5.10.0
+        uses: docker/metadata-action@030e881283bb7a6894de51c315a6bfe6a94e05cf #v6.0.0
         with:
           images: ghcr.io/${{ github.repository_owner }}/spegel
           tags: type=raw,value=${{ steps.prep.outputs.VERSION }}