The technical reason for choosing Python 3.6 no longer applies due to how quickly cosmo has advanced in the past months (in particular thread support). jart and ahgamut were the ones who made it happen, I am only a python.com user.
But if you want Django 4 and Python 3.11, here is some info copied from the website:
3. Newer Python and newer Django? It is possible to have a djngo.com with Django 4 and Python 3.11. Solved by aghgamut who was the first to port Python to Cosmopolitan. Please note that this Python and the one that djngo.com use are different, the later has been heavily optimized by jart to run well on cosmo, the former is as close as upstream as you can get. Choose your destiny.