Update bundle (with newest rubocop version) and fix offenses

spec/uploaders/file_uploader_spec.rb

@@ -4,7 +4,7 @@ require 'rails_helper'
 
 describe FileUploader do
   let(:file_path) { Rails.root.join('db/seeds/fibonacci/exercise.rb') }
-  let(:uploader) { described_class.new(FactoryBot.create(:file)) }
+  let(:uploader) { described_class.new(create(:file)) }
 
   before { uploader.store!(File.open(file_path, 'r')) }