lxml 5.0.0 incompatibility - Arithmetic exception

[lxml](https://lxml.de/5.0/changes-5.0.0.html) 5.0.0 was released on Dec 29th 2023.  This update causes an `Arithmetic exception (core dumped)` when using python-xmlsec.

Example code that would fail..
```py
import xmlsec
from lxml import etree
root = None
with open("sign4-in.xml") as f:
    root = etree.parse(f).getroot()
xmlsec.tree.add_ids(root, ["ID"])
```