Investigating windows crash

[HDembinski]

• Tests with Python 3.11 with numpy (<2 or >=2) with numba and scipy work
• ... but fail if also matplotlib is installed
• One can isolate it to matplotlib. Installing it causes crashes elsewhere where numpy is used. This is may be related to these issues
  • [Bug]: Matplotlib crashes Python on Windows after update matplotlib/matplotlib#27564
  • [Bug]: Possible issue with Matplotlib 3.9.1 wheel on Windows only matplotlib/matplotlib#28551
• Pinning to matplotlib==3.9.0 is a workaround

Failing tests

FAILED tests/test_core.py::test_MnMigrad_cfunc
FAILED tests/test_cost.py::test_LeastSquares_name
FAILED tests/test_cost.py::test_BinnedNLL_pulls
FAILED tests/test_minuit.py::test_minos_single_fixed
FAILED tests/test_scipy.py::test_scipy_method[Newton-CG-True-False]
FAILED tests/test_minuit.py::test_confidence_level[False-0.5]
FAILED tests/test_scipy.py::test_scipy_method[trust-ncg-True-True]
FAILED tests/test_minimize.py::test_hess_warn
FAILED tests/test_minuit.py::test_minos_new_min
FAILED tests/test_scipy.py::test_scipy_bounded[None-0-None-1]
FAILED tests/test_scipy.py::test_scipy_method[TNC-False-False]
FAILED tests/test_repr.py::test_html_merror
FAILED tests/test_cost.py::test_BinnedNLL_ndof_zero
FAILED tests/test_minuit.py::test_mncontour[True-1-func0_grad]
FAILED tests/test_repr.py::test_html_params

Among these, test_core.py::test_MnMigrad_cfunc is puzzling, for instance, because this does not use matplotlib for sure, and also runs if only numba and scipy are installed.