Try updating PR activity types

Author: rzuckerm

.github/workflows/pr-labeler.yml

@@ -1,6 +1,10 @@
 name: "Pull Request Labeler"
 on:
-  pull_request_target:
+  pull_request:
+    types:
+    - opened
+    - edited
+    - synchronize
     branches:
     - main
     paths: