Fix permissions for assign PR action.

Author: uhafner

.github/workflows/assign-pr.yml

@@ -1,12 +1,11 @@
 name: 'Auto Assign PR'
 
-on:
-  pull_request:
+on: pull_request_target
 
 jobs:
   add-reviews:
     runs-on: ubuntu-latest
     steps:
-      - uses: kentaro-m/[email protected].2
+      - uses: kentaro-m/[email protected].1
         with:
           repo-token: "${{ secrets.GITHUB_TOKEN }}"