ci: modify the time for scheduled execution of action

Author: Lesords

.github/workflows/stale.yml

@@ -3,7 +3,7 @@ name: 'Close stale issues and PRs'
 on:
   workflow_dispatch:
   schedule:
-    - cron: '* 4 * * *'
+    - cron: '0 4 * * *'
 
 jobs:
   stale: