Bump dependabot/fetch-metadata from 1 to 2

Bumps [dependabot/fetch-metadata](https://github.com/dependabot/fetch-metadata) from 1 to 2.
- [Release notes](https://github.com/dependabot/fetch-metadata/releases)
- [Commits](dependabot/fetch-metadata@v1...v2)

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

Signed-off-by: dependabot[bot] <[email protected]>

.github/workflows/reviewer.yml

@@ -16,7 +16,7 @@ jobs:
     steps:
       - id: dependabot-metadata
         name: Fetch Dependabot metadata
-        uses: dependabot/fetch-metadata@v1
+        uses: dependabot/fetch-metadata@v2
       - name: Enable auto-merge for Dependabot PRs
         run: gh pr merge --auto --merge "$PR_URL"
       - name: Approve patch and minor version updates