Fixing dependabot PR check (#1045)

Author: alexcottner

.github/workflows/ci.yaml

@@ -45,7 +45,7 @@ jobs:
       contents: write
       pull-requests: write
     runs-on: ubuntu-latest
-    if: ${{ github.actor == 'dependabot[bot]' }}
+    if: ${{ github.event.pull_request.user.login == 'dependabot[bot]' }}
     steps:
       - name: Enable Dependabot automation
         uses: mozilla/syseng-pod/actions/dependabot-automerge@main