Bug 577894 - Security Issue -- XXE Attack

Applications using XMLMemento are vulnerable to XXE Attack

see https://docs.oracle.com/en/java/javase/17/security/java-api-xml-processing-jaxp-security-guide.html

Change-Id: I3f413123158ce2ff76ff250f84fe338520d0882e
Reviewed-on: https://git.eclipse.org/r/c/platform/eclipse.platform.debug/+/187978
Reviewed-by: Kalyan Prasad Tatavarthi <kalyan_prasad@in.ibm.com>
Tested-by: Platform Bot <platform-bot@eclipse.org>
(cherry picked from commit e81a54a076c159432d2e8b1c661d94a805516849)
Reviewed-on: https://git.eclipse.org/r/c/platform/eclipse.platform.debug/+/188343
Tested-by: Sarika Sinha <sarika.sinha@in.ibm.com>
Reviewed-by: Sarika Sinha <sarika.sinha@in.ibm.com>