Auto-update now occurs monthly instead of weekly (#43379)

* Fixes #43364

* Refactor typo in cron

Author: 1nF0rmed

.github/workflows/autoupdate-pre-commit-config.yml

@@ -2,7 +2,7 @@ name: "Update pre-commit config"
 
 on:
   schedule:
-    - cron: "0 7 * * 1" # At 07:00 on each Monday.
+    - cron: "0 7 1 * *" # At 07:00 on 1st of every month.
   workflow_dispatch:
 
 jobs: