Namespaces not retained with FileUrisStreamingXMLLoader

FileUrisStreamingXMLLoader is dropping namespaces when documents use a default namespace (no prefix) running in Java 11+.

It seems that it did not matter if DocumentBuilderFactory was namespaceaware in Java 8 (retained namespaces regardless of whether namespaceaware was true or false), but when running with Java 11 or greater, it must be set to true.