ci: update lock workflow to latest action release

Author: clydin

.github/workflows/lock-closed.yml

@@ -9,7 +9,6 @@ jobs:
   lock_closed:
     runs-on: ubuntu-latest
     steps:
-      - uses: angular/dev-infra/github-actions/lock-closed@7f7ef07
+      - uses: angular/dev-infra/github-actions/lock-closed@a4fd924
         with:
           lock-bot-key: ${{ secrets.LOCK_BOT_PRIVATE_KEY }}
-          locks-per-execution: 100