Update .github/workflows/dependabot-automerge.yml

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

Author: mahata

.github/workflows/dependabot-automerge.yml

@@ -10,7 +10,7 @@ permissions:
 jobs:
   automerge:
     runs-on: ubuntu-latest
-    if: github.actor == 'dependabot[bot]'
+    if: github.event.pull_request.user.login == 'dependabot[bot]'
     steps:
       - name: Fetch Dependabot metadata
         id: metadata