style(rubocop): fix all safe auto correctable offenses

config/initializers/smtp.rb

@@ -1,5 +1,5 @@
-require 'postal/config'
+require "postal/config"
 if Postal.config&.smtp
   ActionMailer::Base.delivery_method = :smtp
-  ActionMailer::Base.smtp_settings = {:address => Postal.config.smtp.host, :user_name => Postal.config.smtp.username, :password => Postal.config.smtp.password, :port => Postal.config.smtp.port || 25}
+  ActionMailer::Base.smtp_settings = { address: Postal.config.smtp.host, user_name: Postal.config.smtp.username, password: Postal.config.smtp.password, port: Postal.config.smtp.port || 25 }
 end