style(rubocop): Style/StringLiterals

config/initializers/zeitwerk.rb

@@ -3,5 +3,5 @@
 Rails.autoloaders.each do |autoloader|
   # Ignore the message DB migrations directory as it doesn't follow
   # Zeitwerk's conventions and is always loaded and executed in order.
-  autoloader.ignore(Rails.root.join('lib/postal/message_db/migrations'))
+  autoloader.ignore(Rails.root.join("lib/postal/message_db/migrations"))
 end