Update firebase-hosting-pull-request.yml

Author: ehsanhajian

.github/workflows/firebase-hosting-pull-request.yml

@@ -2,7 +2,7 @@
 # https://github.com/firebase/firebase-tools
 
 name: Deploy to Firebase Hosting on PR
-'on': pull_request_target
+'on': pull_request
 jobs:
   build_and_preview:
     if: '${{ github.event.pull_request.head.repo.full_name == github.repository }}'