Bump dependabot/fetch-metadata from 1.6.0 to 2.4.0

Bumps [dependabot/fetch-metadata](https://github.com/dependabot/fetch-metadata) from 1.6.0 to 2.4.0.
- [Release notes](https://github.com/dependabot/fetch-metadata/releases)
- [Commits](dependabot/fetch-metadata@v1.6.0...v2.4.0)

---
updated-dependencies:
- dependency-name: dependabot/fetch-metadata
  dependency-version: 2.4.0
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

.github/workflows/on_pull_request.yml

@@ -64,7 +64,7 @@ jobs:
       # will not occur.
       - name: Dependabot metadata
         id: dependabot-metadata
-        uses: dependabot/fetch-metadata@v1.6.0
+        uses: dependabot/fetch-metadata@v2.4.0
         with:
           github-token: "${{ secrets.GITHUB_TOKEN }}"
       # Here the PR gets approved.