fix cron format issue

.github/workflows/daily_regression.yaml

@@ -3,7 +3,7 @@ name: daily_regression
 on:
   schedule:
     # * is a special character in YAML so you have to quote this string
-    - cron:  '0 0 * * * *'
+    - cron:  '0 0 * * *'
 
 concurrency:
   group: ${{ github.workflow }}-${{ github.ref }}