Fix double heston convergence

[lsbardel]

No description provided.

[codecov-commenter]

Codecov Report

❌ Patch coverage is 66.66667% with 7 lines in your changes missing coverage. Please review.
✅ Project coverage is 83.51%. Comparing base (d1e6592) to head (f0b00ab).

Files with missing lines	Patch %	Lines
quantflow/options/heston_calibration.py	28.57%	5 Missing ⚠️
quantflow/options/calibration.py	66.66%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #49      +/-   ##
==========================================
- Coverage   84.95%   83.51%   -1.44%     
==========================================
  Files          61       61              
  Lines        3462     3469       +7     
==========================================
- Hits         2941     2897      -44     
- Misses        521      572      +51     

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