Run update only once per month

Author: christophfroehlich

.github/workflows/update-pre-commit.yml

@@ -5,7 +5,7 @@ name: Auto Update pre-commit
 on:
   workflow_dispatch:
   schedule:
-    - cron: '0 0 * * 0'  # Run every Sunday at midnight
+    - cron: '0 0 1 * *'  # Runs at 00:00, on day 1 of the month
 
 jobs:
   auto_update_and_create_pr: