Artifactory backend broken for Python 3.13

[hagenw]

When trying to download a dataset from an Artifactory backend in Python 3.13 it fails with:

>>> db = audb.load("########", version="2025.09.10", only_metadata=True)
...
RuntimeError: Cannot find version '2025.09.10' for database '########'.

whereas with Python <=3.12 it works.