Bump dependabot/fetch-metadata from 1.4.0 to 1.5.1

Bumps [dependabot/fetch-metadata](https://github.com/dependabot/fetch-metadata) from 1.4.0 to 1.5.1.
- [Release notes](https://github.com/dependabot/fetch-metadata/releases)
- [Commits](dependabot/fetch-metadata@v1.4.0...v1.5.1)

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

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

Author: dependabot[bot]

.github/workflows/on-pull-request.yml

@@ -50,7 +50,7 @@ jobs:
       # will not occur.
       - name: Dependabot metadata
         id: dependabot-metadata
-        uses: dependabot/fetch-metadata@v1.4.0
+        uses: dependabot/fetch-metadata@v1.5.1
         with:
           github-token: "${{ secrets.GITHUB_TOKEN }}"
       # Here the PR gets approved.