Doesn't work anymore with Django 5.2

[glebret]

Since the upgrade to Django from 5.0 to 5.2, django-mail-templated doesn't work anymore.

[artemrizhov]

Thanks for reporting the issue. I’ll try to take a look and see what’s going on. The code is actually quite small and simple. If you have a chance to fix it yourself, I’d be happy to review your pull request.