deprecated pyproject.toml tables

[kfchou]

Please update the pyproject.toml file

• SetuptoolsDeprecationWarning: project.license as a TOML table is deprecated

    ********************************************************************************
    Please use a simple string containing a SPDX expression for `project.license`. You can also use `project.license-files`. (Both options available on setuptools>=77.0.0).
  
    By 2026-Feb-18, you need to update your project and remove deprecated calls
    or your builds will no longer be supported.
  
    See https://packaging.python.org/en/latest/guides/writing-pyproject-toml/#license for details.
    ********************************************************************************
  

• SetuptoolsDeprecationWarning: License classifiers are deprecated.