Change the retry limit in error of web push notification (#11292)

- Change the maximum count of retry for web push notification (Default -> 5).
   - In case of high load of subscribe server, the retries will be repeated many times.
   - Because the retries occupy the default queue, maximum retry count should be reduced.

app/workers/web/push_notification_worker.rb

@@ -3,7 +3,7 @@
 class Web::PushNotificationWorker
   include Sidekiq::Worker
 
-  sidekiq_options backtrace: true
+  sidekiq_options backtrace: true, retry: 5
 
   def perform(subscription_id, notification_id)
     subscription = ::Web::PushSubscription.find(subscription_id)