Update for rubocop/-rails/-omakase changes

.rubocop.yml

-inherit_gem: { rubocop-rails-omakase: rubocop.yml }
+inherit_gem:
+  rubocop-rails-omakase: rubocop.yml
 require:
-  - rubocop-capybara
+- rubocop-capybara
+plugins:
+- rubocop-rails
 AllCops:
-    NewCops: enable
+  NewCops: enable

Gemfile

@@ -26,7 +26,7 @@ group :development, :test do
   # See https://guides.rubyonrails.org/debugging_rails_applications.html#debugging-with-the-debug-gem
   gem "debug", platforms: %i[mri windows]
 
-  gem "rubocop-rails-omakase", "~> 1.1"
+  gem "rubocop-rails-omakase", "~> 1.1", require: false
 
   gem "rubocop-capybara", "~> 2.21"
 end