Revert "approve if the PR branch belongs to dependabot"

This reverts commit aabcdc4.

.github/workflows/auto-dependabot.yml

@@ -27,7 +27,7 @@ jobs:
  # Pull request Auto merge is not enabled for this repository
  dependabot:
  runs-on: ubuntu-latest
- if: startsWith(github.head_ref, 'dependabot/')
+ if: github.event.pull_request.user.login == 'dependabot[bot]'
  steps:
  - name: Dependabot metadata
  id: metadata