Bump docker/metadata-action from 5.9.0 to 6.0.0 (#142)

Bumps [docker/metadata-action](https://github.com/docker/metadata-action) from 5.9.0 to 6.0.0.
- [Release notes](https://github.com/docker/metadata-action/releases)
- [Commits](docker/metadata-action@318604b...030e881)

---
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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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

.github/workflows/release.yml

@@ -51,7 +51,7 @@ jobs:
 
       - name: Extract metadata (tags, labels) for Docker
         id: meta
-        uses: docker/metadata-action@318604b99e75e41977312d83839a89be02ca4893
+        uses: docker/metadata-action@030e881283bb7a6894de51c315a6bfe6a94e05cf
         with:
           images: helvethink/gitlab-ci-exporter