python/xml_xxe_file: silence Dlint warnings about XXE
python/xml_xxe_file: silence Dlint warnings about XXE

Duo Labs' dlint static analyzer reported warnings:

    xml_xxe_file.py:53:1: DUO107 improper use of XML modules, prefer "defusedxml"
    xml_xxe_file.py:93:9: DUO107 improper use of XML modules, prefer "defusedxml"

This is expected ;)

fishilico/shared,fishilico/shared,fishilico/shared,fishilico/shared,fishilico/shared,fishilico/shared,fishilico/shared