Switch label workflow trigger to pull_request_target

Changed the GitHub Actions workflow trigger from 'pull_request' to 'pull_request_target' to allow the workflow to run with access to secrets and on forks. This is useful for workflows that need elevated permissions or access to repository secrets.

Author: guidezpl

.github/workflows/label_pull_requests.yml

@@ -8,7 +8,7 @@
 name: Label pull request
 
 on:
-- pull_request
+- pull_request_target
 
 jobs:
   label: