[build] use pull_request instead of pull_request target on PR label commenting

Author: titusfortner

.github/workflows/label-commenter.yml

@@ -4,7 +4,7 @@ name: Label Commenter
 on:
   issues:
     types: [ labeled ]
-  pull_request_target:
+  pull_request:
     types: [labeled]
 
 permissions: