support Python 3.12

[kitagry]

• support Python3.12
• unsupport Python3.8

and some changes.

• flake8 error: E721 do not compare types, for exact checks use is / is not, for instance checks use isinstance()
  • I change type(hoge) == fuga to isinstance(hoge, fuga)

[hirosassa]

I think we need to re-lock to update numpy to 1.26.
https://github.com/m3dev/gokart/blob/master/poetry.lock#L1224

ref: https://numpy.org/news/#numpy-1260-released

P.S.
From the numpy document displayed above, we need to deprecate Python 3.8.

[kitagry]

Hmm. numpy 1.25 drop Python 3.8 support. https://github.com/numpy/numpy/releases/tag/v1.25.1

So, in order to we support numpy 1.26 we should drop Python 3.8.

Do you think about this? @hirosassa @Hi-king @mski-iksm @ujiuji1259

[hirosassa]

I agree with dropping Python38 coz they ended active support on May 2021.

https://endoflife.date/python

[kitagry]

Hmm, pyarrow doesn't support python3.12 yet. apache/arrow#37880

[hirosassa]

@kitagry hooray!! 🎉 it will be published in around 2w
apache/arrow#37880

[kitagry]

pyproject-flake8 doen't support python3.12. So, I use Python3.11 for format CI.

csachs/pyproject-flake8#30

[Hi-king]

I Think It's OK because it's just for formatting

[kitagry]

@Hi-king @mski-iksm @ujiuji1259 @hirosassa Please review!

And, is it ok to remove python 3.8 test CI from required and add python 3.12 test CI to required?

[Hi-king]

@kitagry THX!

[Hi-king]

I've changed required actions :)