update automerge

.github/workflows/dependabot-automerge.yml

@@ -13,12 +13,17 @@ jobs:
     runs-on: ubuntu-latest
     if: ${{ github.actor == 'dependabot[bot]' }}
     steps:
-      - name: Dependabot metadata
+      - name: metadata
         id: metadata
         uses: dependabot/fetch-metadata@v1.1.1
         with:
           github-token: "${{ secrets.TOKEN }}"
-      - name: Enable auto-merge for Dependabot PRs
+      - name: approve
+        run: gh pr review --approve "$PR_URL"
+        env:
+          PR_URL: ${{github.event.pull_request.html_url}}
+          GITHUB_TOKEN: ${{secrets.TOKEN}}
+      - name: merge
         if: ${{contains(steps.metadata.outputs.dependency-names, 'go.unistack.org')}}
         run: gh pr merge --auto --merge "$PR_URL"
         env: