CHORE: move nightly build schedule to 4:30 AM IST (#686)

### Work Item / Issue Reference

ADO Work Item ID: Fixed
[AB#46528](https://sqlclientdrivers.visualstudio.com/c6d89619-62de-46a0-8b46-70b92a84d85e/_workitems/edit/46528)

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### Summary

Moves the daily scheduled build in `build-release-package-pipeline.yml`
from 12:30 AM IST to 4:30 AM IST (cron `0 19` -> `0 23` UTC). Comment
and displayName updated to match. No other pipeline behavior changes.

Co-authored-by: Gaurav Sharma <223556219+Copilot@users.noreply.github.com>

Author: bewithgaurav

OneBranchPipelines/build-release-package-pipeline.yml

@@ -36,12 +36,12 @@ pr:
     include:
       - main
 
-# Schedule: Daily builds at 12:30 AM IST (19:00 UTC previous day)
+# Schedule: Daily builds at 4:30 AM IST (23:00 UTC previous day)
 # Cron format: minute hour day month weekday
 # always:true = run even if no code changes
 schedules:
-  - cron: "0 19 * * *"
-    displayName: Daily run at 12:30 AM IST
+  - cron: "0 23 * * *"
+    displayName: Daily run at 4:30 AM IST
     branches:
       include:
         - main