Pin the Django requirements

[pamelafox]

Currently unpinned and I got a report its not working for latest Django.

Need to pin per one of the strategies in http://blog.pamelafox.org/2023/10/strategies-for-managing-dependencies.html

[kjaymiller]

I'm a fan of piptools and pinning all the versions I vote for that one

[kjaymiller]

I do wonder how pip-tools would work with the jinja templates

[kjaymiller]

@pamelafox bringing this back up as we're closer to Django 5.0 and haven't tested against it (and haven't decided if we should pin our version to <=5.0.0.