Remove deprecated warning and update license format to latest format

[ykim-akamai]

📝 Description

Deprecation warning is coming from setuptools, on how license variable is defined in pyproject.toml file defines the project.license field. Detailed build warnings below during make install:

/private/var/folders/g4/6nz043hs45qbblr441jmsq0c0000gq/T/build-env-ivsf1fb6/lib/python3.10/site-packages/setuptools/config/_apply_pyprojecttoml.py:82: 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.

    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.
    ********************************************************************************

!!

✔️ How to Test

1. Check out this branch
2. make install and verify deprecation warnings is removed

📷 Preview

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[lgarber-akamai]

Thank you for identifying & addressing this!