Upgrade to Django 4.2

[Bomme]

We should upgrade to the next LTS version of Django (4.2) since the current (3.2 LTS) will reach EOL April 2024.

Recommended reading https://docs.djangoproject.com/en/4.2/howto/upgrade-version/

If you’re upgrading through more than one feature version (e.g. 2.0 to 2.2), it’s usually easier to upgrade through each feature release incrementally (2.0 to 2.1 to 2.2) rather than to make all the changes for each feature release at once. For each feature release, use the latest patch release (e.g. for 2.1, use 2.1.15).

Steps:

• Upgrade to > Python 3.8
• Test for deprecations
• Check dependencies for compatibility issues
  • django-admin-sortable
  • django-amazon-ses
  • django-cors-headers
  • django-debug-toolbar
  • django-extensions
  • django-modeladmin-reorder
  • django-multiupload
  • django-oauth-toolkit
  • django-recaptcha
  • django-redis
  • django-silk
  • djangorestframework
  • sentry-sdk
• Upgrade to 4.0
• Upgrade to 4.1
  • Logging out via GET requests to the built-in logout view is deprecated. Use POST requests instead.
• Upgrade to 4.2

Potential follow-up steps:

• replace django-redis with django.core.cache.backends.redis.RedisCache? See Is this relevant with Django 4.0? jazzband/django-redis#585 for a discussion
• Set USE_TZ = True Migration guide
• Switch to Psycopg 3 https://docs.djangoproject.com/en/4.2/releases/4.2/#psycopg-3-support