👷 Update workflow

Author: gluons

.github/workflows/dependabot.yml

@@ -23,7 +23,7 @@ jobs:
     runs-on: ubuntu-latest
     if: github.actor == 'dependabot[bot]'
     env:
-      GITHUB_TOKEN: ${{ github.token }}
+      GITHUB_TOKEN: "${{ secrets.GITHUB_TOKEN }}"
       MERGE_LABELS: "dependencies"
       MERGE_COMMIT_MESSAGE: "🔀 Automerge pull request #${{ github.event.pull_request.number }}"
     steps: