Prepare to support ruby 3.3.

lib/ad_banner/engine.rb

@@ -1,6 +1,7 @@
 module AdBanner
   class Engine < ::Rails::Engine
     initializer "ad_banner" do 
+      Rails.application.config.to_prepare do
         OrbitApp.registration "AdBanner", :type => "ModuleApp" do
           module_label "ad_banner.ad_banner"
           base_url File.expand_path File.dirname(__FILE__)
@@ -35,3 +36,4 @@ module AdBanner
       end
     end
   end
+end