www/py-django32: Switch consumers over to Django 3.2

Django 2.2 became End-of-Life on 11th April 2022 and Django 3.2 is the
new LTS (= Long Term Support) release which will be supported until
April 2024.

• Switch the most ports that use www/py-django22 to www/py-django32

• Switch www/seahub over to www/py-djangorestframework

• Ports that are not yet ready for Django 3.2 (only three so far) or those that have already been set with an expiration date were not taken into account.

• Bump PORTREVISION due dependency change where necessary.

PR: 261313
Reviewed by: bofh, dvl, koobs, ultima
Approved by: bofh, dvl, koobs, ultima, sunpoet, Kevin Golding, Ivan Rozhuk,

		Alexander Sieg (maintainers)
		maintainer timeout (remaining maintainers)

Differential Revision: https://reviews.freebsd.org/D34859