Enable Rubocop RSpec/NotToNot (#23723)

spec/validators/url_validator_spec.rb

@@ -27,7 +27,7 @@ RSpec.describe URLValidator, type: :validator do
       let(:compliant) { true }
 
       it 'not calls errors.add' do
-        expect(errors).not_to have_received(:add).with(attribute, any_args)
+        expect(errors).to_not have_received(:add).with(attribute, any_args)
       end
     end
   end