Change Dependabot auto-merge pull request workflow

Author: lulunac27a

.github/workflows/dependabot-merge.yml

@@ -1,13 +1,21 @@
-name: Auto Merge Dependency Updates
+name: Dependabot auto-approve
+on: pull_request
 
-on:
-  - pull_request_target
+permissions:
+  pull-requests: write
 
 jobs:
-  run:
+  dependabot:
     runs-on: ubuntu-latest
+    if: github.actor == 'dependabot[bot]'
     steps:
-      - name: Auto Merge Dependabot Updates
-        uses: buluma/gh-action-auto-merge-dependabot-updates@1.0.8
+      - name: Dependabot metadata
+        id: metadata
+        uses: dependabot/fetch-metadata@v2
         with:
-          allowed-actors: dependabot-preview[bot], dependabot[bot]
+          github-token: "${{ secrets.GITHUB_TOKEN }}"
+      - name: Approve a PR
+        run: gh pr review --approve "$PR_URL"
+        env:
+          PR_URL: ${{github.event.pull_request.html_url}}
+          GH_TOKEN: ${{secrets.GITHUB_TOKEN}}