We've had python3.12 container images for some time now but everything
has been running 3.11. 3.11 has been a solid release so there hasn't
been much pressure to update. But as 3.13 and beyond are starting to
show up it would be good for us to start moving foward too.
We start by updating the zookeeper-statsd and haproxy-statsd images as
they are quite simple and should be good canaries for this new python
version. Followups can migrate even more things.
Change-Id: Ib289861e937c2d181d483debb80e7bc30b583d83
81d897997d