build(deps): bump peter-evans/dockerhub-description from 4 to 5 (#7152)

Bumps [peter-evans/dockerhub-description](https://github.com/peter-evans/dockerhub-description) from 4 to 5.
- [Release notes](https://github.com/peter-evans/dockerhub-description/releases)
- [Commits](peter-evans/dockerhub-description@v4...v5)

---
updated-dependencies:
- dependency-name: peter-evans/dockerhub-description
  dependency-version: '5'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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Author: dependabot[bot]

.github/workflows/docker.yml

@@ -113,7 +113,7 @@ jobs:
           tags: ${{ steps.meta.outputs.tags }}
           labels: ${{ steps.meta.outputs.labels }}
       - name: Update repo description
-        uses: peter-evans/dockerhub-description@v4
+        uses: peter-evans/dockerhub-description@v5
         if: github.ref == 'refs/heads/master'
         with:
           readme-filepath: ./etherpad/README.md