ci: disable `lint-sync` for now

.github/workflows/lint-sync.yml

@@ -1,8 +1,8 @@
 name: lint-sync
 on:
-  schedule:
-    # every Sunday at midnight
-    - cron: "0 0 * * 0"
+  # schedule:
+  #   # every Sunday at midnight
+  #   - cron: "0 0 * * 0"
   workflow_dispatch: # allows manual triggering
 
 permissions: