Update rubocop-for-gem.yml

rails/rubocop-for-gem.yml

 require:
+  - rubocop-minitest
   - rubocop-packaging
   - rubocop-performance
+  - rubocop-rails
 
-# gem 'rubocop', '1.65.1', require: false
-# gem 'rubocop-performance', '1.21.1', require: false
-# gem 'rubocop-packaging', '0.5.2', require: false
+# gem "rubocop", "1.65.1", require: false
+# gem "rubocop-minitest", "0.35.1", require: false
+# gem "rubocop-performance", "1.21.1", require: false
+# gem "rubocop-packaging", "0.5.2", require: false
 AllCops:
   NewCops: enable # pending cops get enabled by default and must be disabled by hand, if needed