ci: don't run stale workflow jobs in parallel (#36967)

.github/workflows/stale.yml

@@ -25,6 +25,8 @@ jobs:
           only-pr-labels: not-a-real-label
   pending-repro:
     runs-on: ubuntu-latest
+    if: ${{ always() }}
+    needs: stale
     steps:
       - uses: actions/stale@3de2653986ebd134983c79fe2be5d45cc3d9f4e1
         with: