Bump dependabot/fetch-metadata from 2 to 3

Bumps [dependabot/fetch-metadata](https://github.com/dependabot/fetch-metadata) from 2 to 3.
- [Release notes](https://github.com/dependabot/fetch-metadata/releases)
- [Commits](dependabot/fetch-metadata@v2...v3)

---
updated-dependencies:
- dependency-name: dependabot/fetch-metadata
  dependency-version: '3'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

.github/workflows/auto-merge.yml

@@ -18,7 +18,7 @@ jobs:
     steps:
       - name: Dependabot metadata
         id: metadata
-        uses: dependabot/fetch-metadata@v2
+        uses: dependabot/fetch-metadata@v3
       - name: Enable auto-merge for non-major updates
         if: ${{ steps.metadata.outputs.update-type != 'version-update:semver-major' }}
         run: gh pr merge --squash --auto "${{ github.event.pull_request.html_url }}"