add shopify rubocop

config/application.rb

@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 require_relative "boot"
 
 require "rails"
@@ -22,7 +23,7 @@ Bundler.require(*Rails.groups)
 module XStake
   class Application < Rails::Application
     # Initialize configuration defaults for originally generated Rails version.
-    config.load_defaults 6.1
+    config.load_defaults(6.1)
 
     # Configuration for the application, engines, and railties goes here.
     #