Merge branch 'frozen-string-enable-lib-gitlab-external-auth' into 'master'

Enable frozen string for external auth

See merge request gitlab-org/gitlab!20027

spec/lib/gitlab/external_authorization/access_spec.rb

+# frozen_string_literal: true
+
 require 'spec_helper'
 
 describe Gitlab::ExternalAuthorization::Access, :clean_gitlab_redis_cache do

spec/lib/gitlab/external_authorization/cache_spec.rb

+# frozen_string_literal: true
+
 require 'spec_helper'
 
 describe Gitlab::ExternalAuthorization::Cache, :clean_gitlab_redis_cache do

spec/lib/gitlab/external_authorization/client_spec.rb

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

spec/lib/gitlab/external_authorization/logger_spec.rb

+# frozen_string_literal: true
+
 require 'spec_helper'
 
 describe Gitlab::ExternalAuthorization::Logger do

spec/lib/gitlab/external_authorization/response_spec.rb

+# frozen_string_literal: true
+
 require 'spec_helper'
 
 describe Gitlab::ExternalAuthorization::Response do