Fix license

[d-chambers]

Description

This PR fixes the license metadata in the pyproject.toml and the name of the copyright holder (unidas developers).

Checklist

I have (if applicable):

• referenced the GitHub issue this PR closes.
• documented the new feature with docstrings or appropriate doc page.
• included a test.
• added the "ready_for_review" tag once the PR is ready to be reviewed.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 93.18%. Comparing base (c19d93c) to head (0d5e84a).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main       #4   +/-   ##
=======================================
  Coverage   93.18%   93.18%           
=======================================
  Files           1        1           
  Lines         308      308           
=======================================
  Hits          287      287           
  Misses         21       21           

Flag	Coverage Δ
unittests	93.18% <100.00%> (ø)

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