https://github.com/urllib3/urllib3/releases/tag/2.3.0

The plugin pytest-freezegun is more or less dead, last activity was in
2020.

This is the last package that depends on python-pytest-freezegun, so
we'll be able to move that to AUR once this has been released.

https://github.com/urllib3/urllib3/releases/tag/1.26.20

As using sphinx in makedepends introduces an unnecessary circular
dependency, remove it and the -docs split package.

Upstream provides documentation for all versions at:
https://urllib3.readthedocs.io/en/stable/



Signed-off-by: David Runge <dvzrv@archlinux.org>

Remove the need for python-mock by using unittest.mock.
Switch to PEP517.
Consolidate dependencies.