Correct README since Python 3.12 is now supported

[liopeer]

Changes

• README stated that Python 3.12 is not supported yet due to PyTorch not supporting 3.12. This is outdated and instead now true for Python 3.13
• Issue tracking for PyTorch's Python 3.13 support: https://github.com/pytorch/pytorch/issues/130249

[codecov[bot]]

Codecov Report

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

Project coverage is 84.93%. Comparing base (a1923e4) to head (d44578a). Report is 1 commits behind head on master.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #1727 +/- ## ======================================= Coverage 84.93% 84.93% ======================================= Files 158 158 Lines 6567 6567 ======================================= Hits 5578 5578 Misses 989 989 ```

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