Change schedule to 4x/daily

.github/workflows/sonic_image_links_create_workflow.yml

@@ -5,7 +5,7 @@ name: Run the shell script to generate sonic image links in sonic_image_links.js
 # Run the script once in a minute. Github may take 15 minutes to run this even though we request once in a minute, which is OK.
 on:
   schedule:
-    - cron:  '* * * * *'
+    - cron:  '13 2,8,14,20 * * *'
 
 jobs:
   build: