Merge pull request rails#35935 from y-yagi/fixes_34837

Fix loading `ActionMailbox::BaseController` when CSRF protection is disabled

Author: georgeclaghorn

actionmailbox/app/controllers/action_mailbox/base_controller.rb

@@ -3,7 +3,7 @@
 module ActionMailbox
   # The base class for all Action Mailbox ingress controllers.
   class BaseController < ActionController::Base
-    skip_forgery_protection
+    skip_forgery_protection if default_protect_from_forgery
 
     before_action :ensure_configured