Update nightly release schedule (#19048)

This commit moves the iree nightly wheel release to start at 10 PM PST
which should mean the wheels are available by 2 AM PST. This allows
nightly testing of projects that depend on IREE to use the latest
commits instead of a one-day delay.

.github/workflows/schedule_candidate_release.yml

@@ -1,8 +1,9 @@
 name: Schedule candidate release
 
 on:
+  # Scheduled for 10:00 PM PST
   schedule:
-    - cron: "0 10 * * *"
+    - cron: "0 5 * * *"
 
   workflow_dispatch:
     inputs: