Update actionview-component require process

Following a change to the docs at
https://github.com/github/view_component#installation and
https://github.com/github/view_component#setting-up-rspec, part of a
change to rename this gem to view_component (because it's not going to
be in Rails 6.1).

ViewComponent/view_component#206

config/application.rb

@@ -9,7 +9,7 @@
 require "action_mailer/railtie"
 require "action_view/railtie"
 
-require "action_view/component"
+require "view_component/engine"
 
 # Require the gems listed in Gemfile, including any gems
 # you've limited to :test, :development, or :production.

spec/rails_helper.rb

@@ -6,7 +6,7 @@
 abort('The Rails environment is running in production mode!') if Rails.env.production?
 require 'rspec/rails'
 # Add additional requires below this line. Rails is not loaded until this point!
-require 'action_view/component/test_helpers'
+require 'view_component/test_helpers'
 # Requires supporting ruby files with custom matchers and macros, etc, in
 # spec/support/ and its subdirectories. Files matching `spec/**/*_spec.rb` are
 # run as spec files by default. This means that files in spec/support that end
@@ -69,7 +69,7 @@
 
   config.include FactoryBot::Syntax::Methods
 
-  config.include ActionView::Component::TestHelpers
+  config.include ViewComponent::TestHelpers, type: :component
 
   config.before { Faker::UniqueGenerator.clear }