dial back test frequency for released versions

Author: icweaver

.github/workflows/CI_release.yml

@@ -5,7 +5,7 @@ on:
     branches: [main]
   pull_request:
   schedule:
-    - cron:  '15 2 * * *' # 2:15 AM UTC every day
+    - cron:  '15 2 * * 1' # 2:15 AM UTC every Monday
 
 jobs:
   test-release: