update GitHub Actions workflow to use PERSONAL_TOKEN for auto-assign

Author: iitzIrFan

.github/workflows/auto-assign.yml

@@ -12,7 +12,7 @@ jobs:
     steps:
       - uses: wow-actions/auto-assign@v3
         with:
-          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+          GITHUB_TOKEN: ${{ secrets.PERSONAL_TOKEN }}
           reviewers: |
             sanjay-kv
             iitzIrFan