remove needless requires - it's autoloaded

Author: rmosolgo

lib/graphql/testing/mock_action_cable.rb

@@ -5,8 +5,6 @@ module Testing
     # Any methods to support the mock backend have `mock` in the name.
     #
     # @example Configuring your schema to use MockActionCable in the test environment
-    #   require "graphql/testing/mock_action_cable"
-    #
     #   class MySchema < GraphQL::Schema
     #     # Use MockActionCable in test:
     #     use GraphQL::Subscriptions::ActionCableSubscriptions,

spec/graphql/subscriptions/action_cable_subscriptions_spec.rb

@@ -1,6 +1,5 @@
 # frozen_string_literal: true
 require "spec_helper"
-require "graphql/testing/mock_action_cable"
 
 describe "GraphQL::Subscriptions::ActionCableSubscriptions" do
   class ActionCableTestSchema < GraphQL::Schema