Update RuboCop Performance to 1.13 (#35142).

git-svn-id: http://svn.redmine.org/redmine/trunk@21331 e93f8b46-1217-0410-a6f0-8f06a7374b81

Gemfile

@@ -99,7 +99,7 @@ group :test do
   gem 'webdrivers', '4.6.1', require: false
   # RuboCop
   gem 'rubocop', '~> 1.24.0'
-  gem 'rubocop-performance', '~> 1.12.0'
+  gem 'rubocop-performance', '~> 1.13.0'
   gem 'rubocop-rails', '~> 2.12.4'
 end