Update token in GitHub Actions workflow

- 🔧 Changed the token from PERSONAL_ACCESS_TOKEN to GITHUB_TOKEN for better security and access management.
- 🗑️ Ensured the branch created for the PR is deleted after merging.

-Priyanshu

Author: priyanshu92

.github/workflows/update-pac-cli-version.yml

@@ -65,6 +65,6 @@ jobs:
             _Automated PR generated by GitHub Actions._
           branch: update/cli-version-${{ steps.get_latest_version.outputs.latest_version }}
           delete-branch: true
-          token: ${{ secrets.PERSONAL_ACCESS_TOKEN }}
+          token: ${{ secrets.GITHUB_TOKEN }}
           add-paths: |
             gulpfile.mjs