Upgrade to Django 4.2 LTS (#3652)

- Update psycopg to 3 as it’s not supported by Django 4.2
- Replaced “BaseUserManager().make_random_password”, as it’s deprecated
- Update github action and breakup different checks, making them easier
to debug
- Updated the `makemigrations` checks to display the missing migration
and then fail
- Upgrade django-hijack to 3.4.2
- Update gunicorn to 21.2.0
- Upgrade django slack to 5.19.0
- Upgrade mistune to 3.0.2 (Bug fix release)
- Upgrade whitenoise to 6.6.0
- Update dev dependencies - black, ruff, pre-commit, pytest-django

Closes https://github.com/HyphaApp/hypha/issues/3362