style(rubocop): fix all safe auto correctable offenses

spec/rails_helper.rb

@@ -1,16 +1,16 @@
-ENV['POSTAL_ENV'] = 'test'
+ENV["POSTAL_ENV"] = "test"
 
-require File.expand_path('../../config/environment', __FILE__)
-require 'rspec/rails'
-require 'spec_helper'
-require 'factory_bot'
-require 'database_cleaner'
+require File.expand_path("../config/environment", __dir__)
+require "rspec/rails"
+require "spec_helper"
+require "factory_bot"
+require "database_cleaner"
 
 DatabaseCleaner.allow_remote_database_url = true
 ActiveRecord::Base.logger = Logger.new("/dev/null")
 
 FACTORIES_EXCLUDED_FROM_LINT = []
-Dir[File.expand_path('../factories/*.rb', __FILE__)].each { |f| require f }
+Dir[File.expand_path("factories/*.rb", __dir__)].each { |f| require f }
 
 ActiveRecord::Migration.maintain_test_schema!
 RSpec.configure do |config|
@@ -33,7 +33,7 @@ RSpec.configure do |config|
     # Because the mail databases don't use any transactions, all data left in the
     # database will be left there unless removed.
     DatabaseCleaner.start
-    GLOBAL_SERVER = FactoryBot.create(:server, :provision_database => true)
+    GLOBAL_SERVER = FactoryBot.create(:server, provision_database: true)
   end
 
   config.after(:suite) do
@@ -44,5 +44,4 @@ RSpec.configure do |config|
       DatabaseCleaner.clean
     end
   end
-
 end