*/*dj40*: Deprecate/Set to expire

• Django 4.0 will reach its End-of-Life in April 2023. Deprecate its consumers and set the expiration date accordingly.

Reviewed by: sunpoet, wen (python, via e-mail)
Approved by: sunpoet, wen (python, via e-mail)
Differential Revision: https://reviews.freebsd.org/D38651