Unpin rubocop plugin versions; use current require format (#1635)

Author: corylown

.rubocop.yml

@@ -1,12 +1,10 @@
-plugins:
-  - rubocop-factory_bot
-
 require:
   - rubocop-rspec
   - rubocop-rails
   - rubocop-rake
   - rubocop-rspec_rails
   - rubocop-capybara
+  - rubocop-factory_bot
 
 inherit_from:
   - .rubocop_todo.yml

arclight.gemspec

@@ -37,9 +37,12 @@ Gem::Specification.new do |spec|
   spec.add_development_dependency 'rake', '>= 12.0'
   spec.add_development_dependency 'rspec-rails'
   spec.add_development_dependency 'rubocop', '~> 1.8'
-  spec.add_development_dependency 'rubocop-rails', '~> 2.8'
+  spec.add_development_dependency 'rubocop-capybara'
+  spec.add_development_dependency 'rubocop-factory_bot'
+  spec.add_development_dependency 'rubocop-rails'
   spec.add_development_dependency 'rubocop-rake'
-  spec.add_development_dependency 'rubocop-rspec', '~> 2.3'
+  spec.add_development_dependency 'rubocop-rspec'
+  spec.add_development_dependency 'rubocop-rspec_rails'
   spec.add_development_dependency 'selenium-webdriver'
   spec.add_development_dependency 'simplecov'
   spec.add_development_dependency 'solr_wrapper'