ci: use repository owner as default PR reviewer (#1512)

- Ensure each generated PR is reviewed by the repository owner

Author: flower-elf

.github/workflows/update-userscripts.yml

@@ -37,4 +37,4 @@ jobs:
                   body: |
                       This PR was automatically generated to update the userscripts. It contains the latest changes from the main branch, and should be merged when the new release is ready.
                   branch: update-userscripts
-                  reviewers: Robot-Inventor
+                  reviewers: ${{ github.repository_owner }}