Merge branch 'frozen-string-enable-lib-gitlab-fogbugz' into 'master'

Enable frozen string for fogbugz import

See merge request gitlab-org/gitlab!20133

spec/lib/gitlab/fogbugz_import/client_spec.rb

+# frozen_string_literal: true
+
 require 'spec_helper'
 
 describe Gitlab::FogbugzImport::Client do