Change release schedule to 11PM/11AM PDT.

Better aligns with being able to triage two releases per day during business hours.
diff --git a/.github/workflows/schedule_snapshot_release.yml b/.github/workflows/schedule_snapshot_release.yml
index 006d2a2..79b15b4 100644
--- a/.github/workflows/schedule_snapshot_release.yml
+++ b/.github/workflows/schedule_snapshot_release.yml
@@ -2,7 +2,7 @@
 
 on:
   schedule:
-    - cron: '0 10,22 * * *'
+    - cron: '0 6,18 * * *'
 
   workflow_dispatch: