Fix license in pyproject.toml

[astrofrog]

This is to avoid deprecation warnings

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 96.89%. Comparing base (f2cadaf) to head (40f0dec).
Report is 6 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #49      +/-   ##
==========================================
+ Coverage   96.78%   96.89%   +0.11%     
==========================================
  Files          18       19       +1     
  Lines        2361     2446      +85     
==========================================
+ Hits         2285     2370      +85     
  Misses         76       76              

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