Update pyproject.toml with new license and license-files settings

[bouweandela]

Description

Update pyproject.toml with the new license and license-files settings: https://packaging.python.org/en/latest/guides/writing-pyproject-toml/#license

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 95.58%. Comparing base (3927556) to head (2bc8677).
⚠️ Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2924   +/-   ##
=======================================
  Coverage   95.58%   95.58%           
=======================================
  Files         266      266           
  Lines       15523    15523           
=======================================
  Hits        14837    14837           
  Misses        686      686           

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