pyproject.toml (PEP518), test with Python 3.12

[ods]

Changes

• Write pyproject.toml according to PEP518 (fixes editable build and warnings)
• Update Cython
• Add Python 3.12 to test matrices

Checklist

• [ ] I think the code is well written
• [ ] Unit tests for the changes exist
• [ ] Documentation reflects the changes
• [ ] Add a new news fragment into the CHANGES folder
  • name it <issue_id>.<type> (e.g. 588.bugfix)
  • if you don't have an issue_id change it to the pr id after creating the PR
  • ensure type is one of the following:
  • .feature: Signifying a new feature.
  • .bugfix: Signifying a bug fix.
  • .doc: Signifying a documentation improvement.
  • .removal: Signifying a deprecation or removal of public API.
  • .misc: A ticket has been closed, but it is not of interest to users.
  • Make sure to use full sentences with correct case and punctuation, for example: Fix issue with non-ascii contents in doctest text files.

[codecov[bot]]

Codecov Report

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

Comparison is base (5266f46) 84.27% compared to head (9deee5e) 84.28%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #944 +/- ## ======================================= Coverage 84.27% 84.28% ======================================= Files 87 87 Lines 10039 10039 ======================================= + Hits 8460 8461 +1 + Misses 1579 1578 -1 ``` | [Flag](https://app.codecov.io/gh/aio-libs/aiokafka/pull/944/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=aio-libs) | Coverage Δ | | |---|---|---| | [cext](https://app.codecov.io/gh/aio-libs/aiokafka/pull/944/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=aio-libs) | `79.33% <ø> (+<0.01%)` | :arrow_up: | | [integration](https://app.codecov.io/gh/aio-libs/aiokafka/pull/944/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=aio-libs) | `84.26% <ø> (+<0.01%)` | :arrow_up: | | [purepy](https://app.codecov.io/gh/aio-libs/aiokafka/pull/944/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=aio-libs) | `84.00% <ø> (-0.02%)` | :arrow_down: | | [unit](https://app.codecov.io/gh/aio-libs/aiokafka/pull/944/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=aio-libs) | `51.44% <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=aio-libs#carryforward-flags-in-the-pull-request-comment) to find out more.

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