Update the email schedule to send a notification after the subscriptions have been validated

gso/schedules/send_email_notifications.py

@@ -7,7 +7,7 @@ from gso.worker import celery
 
 
 @celery.task
-@scheduler(CronScheduleConfig(name="Send email notifications", hour="2", minute="30"))
+@scheduler(CronScheduleConfig(name="Send email notifications", hour="4"))
 def send_email_notifications() -> None:
     """Run this task every night at 2:30 AM."""
     start_process("task_send_email_notifications")