Update bundle (with newest rubocop version) and fix offenses

spec/helpers/admin/dashboard_helper_spec.rb

@@ -11,7 +11,7 @@ describe Admin::DashboardHelper do
 
   describe '#docker_data' do
     before do
-      FactoryBot.create(:ruby)
+      create(:ruby)
       dcp = instance_double 'docker_container_pool'
       allow(Runner).to receive(:strategy_class).and_return dcp
       allow(dcp).to receive(:pool_size).and_return({})

spec/helpers/exercise_helper_spec.rb

@@ -4,7 +4,7 @@ require 'rails_helper'
 
 describe ExerciseHelper do
   describe '#embedding_parameters' do
-    let(:exercise) { FactoryBot.build(:dummy) }
+    let(:exercise) { build(:dummy) }
 
     it 'contains the locale' do
       expect(embedding_parameters(exercise)).to start_with("locale=#{I18n.locale}")