Updates BulkRAX to version 5.3.0

Author: Thomas Scherz

Gemfile

@@ -12,7 +12,7 @@ gem 'bigdecimal', '1.3.5'
 
 # For BrowseEverything to work with Hyrax 2.x then we need to pin BE
 gem 'browse-everything', '1.1.0'
-gem 'bulkrax', '~> 4.3.0'
+gem 'bulkrax', '5.3.0'
 gem 'hydra-remote_identifier', github: 'uclibs/hydra-remote_identifier', branch: 'scholar-datacite'
 gem 'kaltura', '0.1.1'
 gem 'rack', '2.2.3'