Add frozen_string_literal for newly added specs

Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

ee/spec/support/helpers/ee/stub_object_storage.rb

+# frozen_string_literal: true
 module EE
   module StubObjectStorage
     def stub_packages_object_storage(**params)

ee/spec/uploaders/packages/package_file_uploader_spec.rb

+# frozen_string_literal: true
 require 'spec_helper'
 
 describe Packages::PackageFileUploader do