Allow indifferent access for content item hash
Allow indifferent access for content item hash

Publishing api returns a content item hash with string keys.
Allow the hash to be accessed with label keys as well.

See https://api.rubyonrails.org/v4.2/classes/ActiveSupport/HashWithIndifferentAccess.html

alphagov/collections-publisher,alphagov/collections-publisher,alphagov/collections-publisher