github-actions: bump dependabot/fetch-metadata from 1.6.0 to 2.0.0

Bumps [dependabot/fetch-metadata](https://github.com/dependabot/fetch-metadata) from 1.6.0 to 2.0.0.
- [Release notes](https://github.com/dependabot/fetch-metadata/releases)
- [Commits](dependabot/fetch-metadata@v1.6.0...v2.0.0)

---
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/dependabot.yml

@@ -15,7 +15,7 @@ jobs:
       github.actor == 'dependabot[bot]'
     steps:
       - id: metadata
-        uses: dependabot/fetch-metadata@v1.6.0
+        uses: dependabot/fetch-metadata@v2.0.0
       - if: >
           steps.metadata.outputs.update-type == 'version-update:semver-patch'
         run: gh pr merge --auto --merge "${{ github.event.pull_request.html_url }}"