Apply automatic rubocop fixes

spec/uploaders/file_uploader_spec.rb

@@ -1,11 +1,14 @@
+# frozen_string_literal: true
+
 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)) }
 
-  before(:each) { uploader.store!(File.open(file_path, 'r')) }
-  after(:each) { uploader.remove! }
+  before { uploader.store!(File.open(file_path, 'r')) }
+
+  after { uploader.remove! }
 
   it 'uses the specified storage directory' do
     expect(uploader.file.path).to start_with(Rails.root.join('public', uploader.store_dir).to_s)