[python-package] add py312

[codecov-commenter]

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Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 96.62%. Comparing base (b56e3b2) to head (fb269aa).

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Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #50 +/- ## ======================================= Coverage 96.62% 96.62% ======================================= Files 52 52 Lines 13686 13686 ======================================= Hits 13224 13224 Misses 462 462 ``` | [Flag](https://app.codecov.io/gh/gph82/mdciao/pull/50/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Guillermo+P%C3%A9rez-Hern%C3%A1ndez) | Coverage Δ | | |---|---|---| | [unittests](https://app.codecov.io/gh/gph82/mdciao/pull/50/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Guillermo+P%C3%A9rez-Hern%C3%A1ndez) | `96.62% <ø> (ø)` | | Flags with carried forward coverage won't be shown. [Click here](https://docs.codecov.io/docs/carryforward-flags?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Guillermo+P%C3%A9rez-Hern%C3%A1ndez#carryforward-flags-in-the-pull-request-comment) to find out more.

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