Remove OSQP dependency from pyproject.toml

[timothy-nunn]

We no longer use osqp as the solver for CVXPY in PyVMCON, instead we use clarabel. There is no reason to have this as a dependency anymore.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 48.63%. Comparing base (616f749) to head (e02eff3).
⚠️ Report is 3 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4438      +/-   ##
==========================================
- Coverage   48.63%   48.63%   -0.01%     
==========================================
  Files         151      151              
  Lines       29673    29670       -3     
==========================================
- Hits        14432    14430       -2     
+ Misses      15241    15240       -1     

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