Use python 3.11 on readthedocs build
Despite python 3.12 being used by the readthedocs example, it leads to a build failure due to a known issue with pip on Ubuntu 22.04 with Python 3.12 which manifests as:
AttributeError: module 'pkgutil' has no attribute 'ImpImporter'. Did you mean: 'zipimporter'?
Use python 3.11 instead which should work.
Passing build: https://readthedocs.org/projects/dns-shotgun/builds/22265583/