Update concurrency group for pr label workflow (#45793)

.github/workflows/pr-project-label.yml

@@ -3,9 +3,10 @@ on:
     pull_request_target:
         types:
             - opened
+            - reopened
             - synchronize
 concurrency:
-    group: ${{ github.workflow }}-${{ github.ref }}
+    group: label-pr-${{ github.event_name }}-${{ github.event.action }}-${{ github.event.pull_request.head.ref }}
     cancel-in-progress: true
 
 permissions: {}