allow for latest versions of packaging

[jamesturk]

Right now trying to use django-magiclink alongside current versions of libraries like black results in an error like:

Using python3 (3.12.0)

Updating dependencies
Resolving dependencies... (0.1s)

Because django-magiclink (1.3.0) @ django-magiclink depends on packaging (>=20.9,<22.0)
 and black (23.9.1) depends on packaging (>=22.0), django-magiclink (1.3.0) @ django-magiclink is incompatible with black (23.9.1).
And because no versions of black match >23.9.1,<24.0.0, django-magiclink (1.3.0) @ django-magiclink is incompatible with black (>=23.9.1,<24.0.0).

This requirement can be safely relaxed it seems, this will work until a 2024 version is released.

[simkimsia]

Ah i didn't realize there was an existing PR for this when I wrote #27 and #28

In any case, I have released a fork and patch with instructions on how to pip install as well

at https://github.com/simkimsia/django-magiclink/releases/tag/packaging-upgraded-1.3.0