Modernize Python metadata

[mkoeppe]

Moving them to pyproject.toml

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 1 lines in your changes are missing coverage. Please review.

Project coverage is 52.69%. Comparing base (e838781) to head (f88f507).

Files	Patch %	Lines
src/pyscipopt/_version.py	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #791      +/-   ##
==========================================
- Coverage   52.70%   52.69%   -0.02%     
==========================================
  Files          16       17       +1     
  Lines        3808     3809       +1     
==========================================
  Hits         2007     2007              
- Misses       1801     1802       +1     

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[mmghannam]

Thanks a lot @mkoeppe! this looks so much better. I fixed the conflict with your other PR (by removing the cython<3 requirement). Should be good to merge once the tests pass.