[Chore] Introduce Python 3.12

[nautics889]

It feels like it's time to add support for Python 3.12. Updated pyproject.toml, updated pythonapp.yml slightly, generate new poetry lock-file.

Maybe it's also worth considering what dependabot suggested recently.

---

• (chore): update 'classifiers' in pyproject.toml, add python 3.12
• (chore): update 'target-version' for 'tool.black' in pyproject.toml, add python 3.12
• (chore): add 3.12 python-version for strategy matrix of ci-jobs in pythonapp.yml

[nautics889]

Several CI-jobs were failed as you can see from above, this was caused by multiple reasons.

1. Hooks 'nbqa-black', 'nbqa-pyupgrade', 'nbqa-isort' kept failing untill I specified additional_dependencies.

   Traceback.

   ``` File "C:\Users\\.cache\pre-commit\repolax5e6sq\py_env-python3.12\Lib\site-packages\nbqa\__main__.py", line 28, in from pkg_resources import parse_version ModuleNotFoundError: No module named 'pkg_resources' ```

2. Couldn't leave 'py312' in tool.black's 'target-version', since current implementation of CI tries to execute black --target-version py312 while running tests even for Python 3.7, and consequently fails (cause there can't be installed such version of black which would support --target-version py312). Therefore I suggest leave it the way it works now, the problem gonna disappear after dropping support for old version of Python.

[upbit]

Thanks for contribution! Merged.