chore(deps): bump dependabot/fetch-metadata from 2.3.0 to 2.4.0 (open-telemetry#367)

Bumps [dependabot/fetch-metadata](https://github.com/dependabot/fetch-metadata) from 2.3.0 to 2.4.0.
- [Release notes](https://github.com/dependabot/fetch-metadata/releases)
- [Commits](dependabot/fetch-metadata@d7267f6...08eff52)

---
updated-dependencies:
- dependency-name: dependabot/fetch-metadata
  dependency-version: 2.4.0
  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/dependabot-auto-approve.yml

@@ -11,7 +11,7 @@ jobs:
     steps:
       - name: Dependabot metadata
         id: metadata
-        uses: dependabot/fetch-metadata@d7267f607e9d3fb96fc2fbe83e0af444713e90b7
+        uses: dependabot/fetch-metadata@08eff52bf64351f401fb50d4972fa95b9f2c2d1b
         with:
           github-token: "${{ secrets.GITHUB_TOKEN }}"
       - name: Approve a PR