Add support for Python 3.12

[ammar-khan]

Please add Python 3.12 support

[edgarrmondragon]

This project is compatible with Python 3.12. What problem(s) are you running into?

[johnthagen]

Probably related to the fact there hasn't been a release in over a year and as such the trove classifier does not indicate that Python 3.12 is officially tested/supported

• https://pypi.org/project/nox-poetry/1.0.3/

[gatoniel]

When using Python 3.12, I get the following error

AttributeError: module 'pkgutil' has no attribute 'ImpImporter'. Did you mean: 'zipimporter'?

It can be solved by prepending to the session.install command the following (based on https://stackoverflow.com/a/77364602/10106730)

session.run("python", "-m", "ensurepip", "--upgrade")
session.run("python", "-m", "pip", "install", "--upgrade", "setuptools")
# now comes the
session.install(...)

However, after doing so, I got the warning that nox-poetry was using the pip from .pyenv/shims and not the one from the temporally created virtualenv. Hence, I switched all session.install to session.run("python", "-m", "pip", "install", ...).