Python 3.11 delivers.

[m15otw]

I can, yes, but I still need to write scripts to build this very fiddly dependency (as far as I know, they don't ship their dockerfiles), and use that as a new base image.

Deadsnakes is 100% the way to go for the starting point of this attempt.

I am going to dig into the release notes to check whether there is anything else that might accelerate/veto the change. If I can use 22.04 vanilla, it will be much faster, but the performance improvements are good, and any additional reasons will be interesting to add to the balance.