fix daily scan (#282)

*Issue #, if available:*

*Description of changes:*
fix daily scan schedule run rate to every 6 hours as expected: `cron: '0
*/6 * * *'`

By submitting this pull request, I confirm that you can use, modify,
copy, and redistribute this contribution, under the terms of your
choice.

Author: ezhang6811

.github/workflows/daily-scan.yml

@@ -9,7 +9,7 @@ name: Daily scan
 
 on:
   schedule: # scheduled to run every 6 hours
-    - cron: '0 */6 * * **' #  “At minute 0 past every 6th hour.” 
+    - cron: '0 */6 * * *' #  “At minute 0 past every 6th hour.” 
   workflow_dispatch: # be able to run the workflow on demand
 
 env: