[ISSUE #568]🔨Update label-on-approval.ym

Author: mxsm

.github/workflows/label-on-approval.yml

@@ -1,8 +1,9 @@
 name: Add Label on Approval
 
 on:
-  pull_request_review:
+  pull_request_target:
     types: [ submitted,edited ]
+    branches: [main]
 
 permissions:
   issues: write