Update Cadence nightly schedule to 0 8 UTC (midnight PST)

Author: aliafzal

.github/workflows/build-cadence-runner.yml

@@ -2,7 +2,7 @@ name: Cadence Build & Test
 
 on:
   schedule:
-    - cron: 0 2 * * *
+    - cron: 0 8 * * *
   push:
     branches:
       - main