DEV: remove update_attributes which is deprecated in Rails 6

See: https://github.com/rails/rails/pull/31998

update_attributes is a relic of the past, it should no longer be used.

app/controllers/badges_controller.rb

@@ -45,7 +45,7 @@ class BadgesController < ApplicationController
     if current_user
       user_badge = UserBadge.find_by(user_id: current_user.id, badge_id: @badge.id)
       if user_badge && user_badge.notification
-        user_badge.notification.update_attributes read: true
+        user_badge.notification.update read: true
       end
       if user_badge
         @badge.has_badge = true