The bootstrap/quickstart instructions for Ponton at https://wikitech.wikimedia.org/wiki/Puppet/Pontoon mention grabbing a Buster host, which isn't going to work anymore.
Pontoon should instead bootstrap and work from a Bookworm host, making use of a self-hosted puppetserver
The development branch for this work is sandbox/filippo/pontoon-puppetserver and now contains a modules/pontoon/README.md with instructions to get started.
Note that I've taken this occasion to also rethink/rework how Pontoon user interactions happen: pontoonctl is a new interface to handle interacting with your Pontoon stack