chore(deps): update dependency jgraichen/rubocop-config to v12

Author: renovate[bot]

Gemfile

@@ -6,7 +6,7 @@ gemspec
 
 gem 'rake'
 gem 'rake-release', '~> 1.0'
-gem 'rubocop-config', github: 'jgraichen/rubocop-config', ref: 'v11', require: false
+gem 'rubocop-config', github: 'jgraichen/rubocop-config', ref: 'v12', require: false
 
 group :development do
   gem 'appraisal'