Update rubocop requirement from 1.66.0 to 1.66.1 (#224)

Author: dependabot[bot]

Gemfile

@@ -4,7 +4,7 @@ source 'https://rubygems.org'
 
 gem 'minitest', '5.25.1'
 gem 'rouge', '4.3.0'
-gem 'rubocop', '1.66.0'
+gem 'rubocop', '1.66.1'
 gem 'rubocop-minitest', '0.36.0'
 gem 'rubocop-rake', '0.6.0'