XML External Entity (XXE) vulnerability

Found this from a security vulnerability scan. The following usage in gremlin-core package allows reading XML input stream and could potentially lead to XXE attack.

In general, when XML input containing a reference to an external entity is processed by a weakly configured XML parser, it can lead to an XML external entity (XXE) attack.

https://github.com/apache/tinkerpop/blob/master/gremlin-core/src/main/java/org/apache/tinkerpop/gremlin/structure/io/graphml/GraphMLReader.java#L396

More details on the vulnerability: https://owasp.org/www-community/vulnerabilities/XML_External_Entity_(XXE)_Processing