Avoid too much failures on Rubocop cop changes

This is the same version as:
https://github.com/rspec/rspec-expectations/blob/master/Gemfile#L65

Related:
rspec/rspec-dev#222 (comment)

Author: benoittgt

Gemfile

@@ -57,7 +57,7 @@ end
 
 gem "rubyzip", '~> 1.2'
 
-gem 'rubocop'
+gem 'rubocop', "~> 0.52.1"
 
 custom_gemfile = File.expand_path("../Gemfile-custom", __FILE__)
 eval_gemfile custom_gemfile if File.exist?(custom_gemfile)