more image versions for derivative images

i'm looking at dropping the docker hub images from fabric-tasks and i'm missing some stuff.

the default image is python:latest, and that's easy, we can just use containers.torproject.org/tpo/tpa/base-images/python for that (i guess?) we also use python:3.11, which is basically the same (bookworm).

(in fact, python:latest is python 3.13 now, which would more likely be sid or trixie).

but we also have a python:3.9 image for bullseye.

so it would be nice to have bullseye and sid images fro the python containers.