Prepare to support ruby 3.3.

lib/page_content/engine.rb

@@ -1,6 +1,7 @@
 module PageContent
   class Engine < ::Rails::Engine
     initializer "page_content" do
+      Rails.application.config.to_prepare do
         OrbitApp.registration "PageContent", :type => "ModuleApp" do
           module_label "page_content.page_content"
           base_url File.expand_path File.dirname(__FILE__)
@@ -32,3 +33,4 @@ module PageContent
       end
     end
   end
+end