Bump Python version to 3.8
This is required to support Django 4.0.
It should not be a big deal (docker images to update, CI tasks & pre-commit refs).
Bonus point: have a Django check that spew warning when running with python < 3.8
This is required to support Django 4.0.
It should not be a big deal (docker images to update, CI tasks & pre-commit refs).
Bonus point: have a Django check that spew warning when running with python < 3.8