Add django 5.2 support

[Christophe31]

django 5.2 is the new LTS release, django users may want to upgrade from 4.2 to 5.2 these days, a new release adding 5.2 in tests and support would be welcome.

[uhurusurfa]

This is a ported version of django-configurations that has been updated to support the latest Django and Python versions and has a modernised packaging utility and enhanced test suite:
https://github.com/UhuruTechnology/django-configurator/