Python 3.13 support

[mayty]

Python 3.13 was released on Oct. 7, 2024 and is not supported as py_version as of now:

Traceback (most recent call last):
  File "<frozen runpy>", line 198, in _run_module_as_main
  File "<frozen runpy>", line 88, in _run_code
  File "...\.venv\Scripts\isort.exe\__main__.py", line 7, in <module>
    sys.exit(main())
             ~~~~^^
  File "...\.venv\Lib\site-packages\isort\main.py", line 1123, in main
    config = Config(**config_dict)
  File "...\.venv\Lib\site-packages\isort\settings.py", line 531, in __init__
    super().__init__(sources=tuple(sources), **combined_config)
    ~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "<string>", line 105, in __init__
  File "...\.venv\Lib\site-packages\isort\settings.py", line 264, in __post_init__
    raise ValueError(
    ...<3 lines>...
    )
ValueError: The python version 313 is not supported. You can set a python version with the -py or --python-version flag. The following versions are supported: ('all', '2', '27', '3', '310', '311', '312', '36', '37', '38', '39')