Update bundle (with newest rubocop version) and fix offenses

spec/models/consumer_spec.rb

@@ -14,7 +14,7 @@ describe Consumer do
   end
 
   it 'validates the uniqueness of the OAuth key' do
-    consumer.update(oauth_key: FactoryBot.create(:consumer).oauth_key)
+    consumer.update(oauth_key: create(:consumer).oauth_key)
     expect(consumer.errors[:oauth_key]).to be_present
   end