Update update-feed.yaml

Reduce demo update frequency to avoid personal git commit graph saturation

.github/workflows/update-feed.yaml

@@ -8,7 +8,7 @@ on:
     # Adjust refresh schedule here. By default, it runs once per day.
     # Syntax reference: https://docs.github.com/en/actions/reference/events-that-trigger-workflows#schedule
     # Recommended tool: https://crontab.guru/
-    - cron: "0 0 * * *"
+    - cron: "0 0 14 * *"
 
 jobs:
   build: