Use user secret for automerge (#985)

.github/workflows/automerge.yml

@@ -12,18 +12,11 @@ jobs:
     steps:
       - uses: actions/github-script@v7
         with:
-          github-token: ${{secrets.GITHUB_TOKEN}}
+          github-token: ${{secrets.DEPENDABOT_AUTO_MERGE}}
           script: |
             github.rest.issues.createComment({
               issue_number: context.issue.number,
               owner: context.repo.owner,
               repo: context.repo.repo,
               body: '@dependabot merge'
             })
-
-      - name: Enable auto-merge for Dependabot PRs
-        run: gh pr merge --auto --merge "$PR_URL"
-        env:
-          PR_URL: ${{github.event.pull_request.html_url}}
-          GITHUB_TOKEN: ${{secrets.GITHUB_TOKEN}}
-