Update blocked-pr.yaml

Author: justinsheu

.github/workflows/blocked-pr.yaml

@@ -6,6 +6,7 @@ on:
       - opened
       - labeled
       - unlabeled
+      - synchronize
 
 jobs:
   fail-for-blocked:
@@ -15,4 +16,4 @@ jobs:
       - name: Fail if PR is blocked
         run: |
           echo "This PR is currently blocked. Please unblock it before merging."
-          exit 1
+          exit 1