Add support for Python 313

[BenediktBurger]

No description provided.

[BenediktBurger]

These ServerErrors are probably due do some changes in openrpc. Python 313 uses openrpc-10.3.2 (as it is not yet cached, contrary to the other ones)

EDIT: 3.12 works with openrpc-10.3.2

EDIT2: It seems, that openrpc itself does not work with python 3.13, see upstream issue https://gitlab.com/mburkard/openrpc/-/issues/9

[BenediktBurger]

Note that it is still possible to use PyLECO with the integrated fallback version, just uninstall openrpc.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 89.52%. Comparing base (30b307b) to head (0440eed).
Report is 4 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #98      +/-   ##
==========================================
- Coverage   89.62%   89.52%   -0.11%     
==========================================
  Files          38       38              
  Lines        2988     2988              
  Branches      373      312      -61     
==========================================
- Hits         2678     2675       -3     
- Misses        259      262       +3     
  Partials       51       51              

Flag	Coverage Δ
unittests	89.52% <ø> (-0.11%)	⬇️

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