Bump statsmodels to 0.14.5 to fix scipy 1.16+ import error (#420)

[C1587S]

Summary

Updates statsmodels from 0.14.4 to 0.14.5 to resolve import failures with scipy 1.16.0+.

The issue occurred because scipy 1.16.0 removed the internal _lazywhere function from scipy._lib._util, which statsmodels 0.14.4 was importing. This caused ImportError: cannot import name '_lazywhere' when importing statsmodels.formula.api, breaking the damage function modeling in src/dscim/utils/utils.py.

Statsmodels 0.14.5 specifically addresses this compatibility issue and allows the codebase to work with current scipy versions.

Checks

• Verified local compatibility with Python 3.11 + scipy 1.16.0
• All affected tests pass:
  • tests/test_fair_estimations.py
  • tests/test_fair_utils.py
    Added compatibility test script to prevent future regs: test/test_statsmodels_scipy_compatibility.py

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 68.94%. Comparing base (8dae2fe) to head (2331872).
Report is 6 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #429   +/-   ##
=======================================
  Coverage   68.94%   68.94%           
=======================================
  Files          15       15           
  Lines        1755     1755           
=======================================
  Hits         1210     1210           
  Misses        545      545           

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[C1587S]

The unit test was removed because it wasn’t aligned with the purpose of testing the library itself, and the relevant imports are already covered in other existing tests.