CI sync.yml: fixed cron not working

24:00 is an invalid time, so the task won't run

Signed-off-by: DreamConnected <1487442471@qq.com>

Author: DreamConnected

.github/workflows/sync.yml

@@ -2,7 +2,7 @@ name: Sync Fork
 
 on:
   schedule:
-    - cron: '20 15 * * 1,5' # every  12:00
+    - cron: '20 3 * * 1,5' # every  12:00
   workflow_dispatch: # on button click
 
 jobs: