Update bundle (with newest rubocop version) and fix offenses

spec/models/request_for_comment_spec.rb

@@ -3,10 +3,10 @@
 require 'rails_helper'
 
 describe RequestForComment do
-  let!(:rfc) { FactoryBot.create(:rfc) }
+  let!(:rfc) { create(:rfc) }
 
   describe 'scope with_comments' do
-    let!(:rfc2) { FactoryBot.create(:rfc_with_comment) }
+    let!(:rfc2) { create(:rfc_with_comment) }
 
     it 'includes all RfCs with comments' do
       expect(described_class.with_comments).to include(rfc2)