fix: use personal token only for auto-merge (#257)

Author: HavenDV

.github/workflows/auto-merge.yml

@@ -30,10 +30,10 @@ jobs:
         run: gh pr review --approve "$PR_URL"
         env:
           PR_URL: ${{ github.event.pull_request.html_url }}
-          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
 
       - name: Enable auto-merge
         run: gh pr merge --auto --squash "$PR_URL"
         env:
           PR_URL: ${{ github.event.pull_request.html_url }}
-          GH_TOKEN: ${{ secrets.PERSONAL_TOKEN || secrets.GITHUB_TOKEN }}
+          GH_TOKEN: ${{ secrets.PERSONAL_TOKEN }}