We recently had to downgrade our airflow worker Docker image from Bookworm to Bullseye, as we've not (yet?) been successful at building bigtop 1.5 for Bookworm (cf T378954). As a result, the system python version got downgraded from 3.11 to 3.9.
Both are wrong in any case, as our current airflow conda environment pins python to 3.10
Let's make sure we decorrelate the worker python version from the Debian version, by installing python using something like pyenv instead of using the system python,