Document that Python 3.12 is supported

[codecov-commenter]

Codecov Report

All modified lines are covered by tests :white_check_mark:

Comparison is base (363502b) 91.94% compared to head (0cac81e) 91.84%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #474 +/- ## ========================================== - Coverage 91.94% 91.84% -0.11% ========================================== Files 91 91 Lines 10790 10790 Branches 1485 1485 ========================================== - Hits 9921 9910 -11 - Misses 867 878 +11 Partials 2 2 ``` | [Flag](https://app.codecov.io/gh/bloomberg/memray/pull/474/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=bloomberg) | Coverage Δ | | |---|---|---| | [cpp](https://app.codecov.io/gh/bloomberg/memray/pull/474/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=bloomberg) | `84.89% <ø> (-0.31%)` | :arrow_down: | | [python_and_cython](https://app.codecov.io/gh/bloomberg/memray/pull/474/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=bloomberg) | `95.40% <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=bloomberg#carryforward-flags-in-the-pull-request-comment) to find out more. [see 5 files with indirect coverage changes](https://app.codecov.io/gh/bloomberg/memray/pull/474/indirect-changes?src=pr&el=tree-more&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=bloomberg)

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