Merge pull request #3140 from NoPlagiarism/gh_workflow_milestone

ci: pull_request_target & remove useless secret

Author: jjw24

.github/workflows/pr_assignee.yml

@@ -15,5 +15,3 @@ jobs:
     steps:
     - name: Assign PR to creator
       uses: toshimaru/auto-author-assign@v2.1.1
-      with:
-        repo-token: ${{ secrets.GITHUB_TOKEN }}

.github/workflows/pr_milestone.yml

@@ -3,7 +3,7 @@ name: Set Milestone
 # Assigns the earliest created milestone that matches the below glob pattern.
 
 on:
-  pull_request:
+  pull_request_target:
     types: [opened]
 
 permissions: