change license to Apache 2.0 license

[ludwiglierhammer]

No description provided.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 82.10%. Comparing base (8fe62cc) to head (4753e13).
Report is 28 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #69   +/-   ##
=======================================
  Coverage   82.10%   82.10%           
=======================================
  Files          68       68           
  Lines        2571     2571           
=======================================
  Hits         2111     2111           
  Misses        460      460           

Flag	Coverage Δ
unittests	82.10% <ø> (ø)

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[ludwiglierhammer]

❗ set license to "Apache-2.0" in .zenodo.json