Bump docker/metadata-action from 5.4.0 to 5.5.0 (#594)

Bumps [docker/metadata-action](https://github.com/docker/metadata-action) from 5.4.0 to 5.5.0.
- [Release notes](https://github.com/docker/metadata-action/releases)
- [Commits](docker/metadata-action@9dc751f...dbef880)

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

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

Author: dependabot[bot]

.github/workflows/ci.yml

@@ -111,7 +111,7 @@ jobs:
 
       - name: Docker meta
         id: meta
-        uses: docker/metadata-action@9dc751fe249ad99385a2583ee0d084c400eee04e # v5.4.0
+        uses: docker/metadata-action@dbef88086f6cef02e264edb7dbf63250c17cef6c # v5.5.0
         with:
           images: |
             nginx/nginx-prometheus-exporter