ci: Use XEMU_ROBOT_TOKEN for PR creation to trigger build workflow

Author: mborgerson

.github/workflows/bump-subproject-wraps.yml

@@ -42,7 +42,7 @@ jobs:
 
       - name: Create PRs for updates
         env:
-          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+          GH_TOKEN: ${{ secrets.XEMU_ROBOT_TOKEN }}
         run: |
           set -euo pipefail
           git config user.name  "xemu-robot"