Upgrade to Django 4.x

[KipSigei]

Django v4.x has several upgrades to the framework, and some of the benefits for upgrading include improved customization, enhanced security features and performance.

Things to note before upgrading

• Django 4.x has dropped support for PostgreSQL v9.6 and earlier
• It also only supports python 3.8, 3.9 and 3.10
• It has also dropped packages such as PostGIS 2.3, GDAL 2.0 and GEOS 3.5
• Deprecation of functions such as django.utils.text.unescape_entities() and django.utils.http.is_safe url()
• Integration for Redis as a cache via django.core.cache.backends.redis.RedisCache
• The ptyz timezone lib has been deprecated in favor of zoneinfo, example:

<before>
import pytz
pytz.timezone('US/Eastern')

<Now>
import zoneinfo
zoneinfo.ZoneInfo('US/Eastern')