Updated the package for Python 3.12

I updated the package for Python 3.12. I confirmed it's working in 3.12 but I think it can be also compatible with 3.8~

Repository : https://github.com/nawta/python-cpbd-py312
PIP: https://pypi.org/project/cpbd-py312/
You can use via
```
pip install cpbd-py312
```