feat: python 3.12 support

[Laikulo]

Entirely just some adjustments to dependencies.
Based on initial analysis by Sineos over at the discourse: https://klipper.discourse.group/t/discuss-python-versions/20942/10

[Laikulo]

Import test succeeds, runs on a multi-mcu test box with kinematics: None

[Laikulo]

Regression tests pass on py3.12, with fresh dicts built on buster.
py_3_12_tests.txt

[nefelim4ag]

BTW:

$ ~/klippy-env/bin/python3 -m pip list | grep setup
setuptools         75.1.0
$ ~/klippy-env/bin/python3 -m pip list | grep python-can
python-can         3.3.4
$ ~/klippy-env/bin/python3 --version
Python 3.12.6

But of course, the correct versions are better,
If there are green light on 3.12, I can reinstall Klipper with those if it helps with testing and even migrate back to USB-CAN to cover python-can.