Iminuit

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- Smart sampling (`769 <https://github.com/scikit-hep/iminuit/pull/769>`_)
- Enhance interactive (`768 <https://github.com/scikit-hep/iminuit/pull/768>`_)

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- Interactive fitting (`766 <https://github.com/scikit-hep/iminuit/pull/766>`_)

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- Interpolated mncontour (`764 <https://github.com/scikit-hep/iminuit/pull/764>`_)
- Added mnmatrix plot (`763 <https://github.com/scikit-hep/iminuit/pull/763>`_)
- Close mncontour for convenience (`761 <https://github.com/scikit-hep/iminuit/pull/761>`_)
- Update tutorials (`760 <https://github.com/scikit-hep/iminuit/pull/760>`_)

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- fix a bug in error heuristic when parameters have negative values and prevent assigning negative values to errors (`759 <https://github.com/scikit-hep/iminuit/pull/759>`_)

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Fixes
~~~~~
- ``cost.BarlowBeestonLite``: method "hpd" has been modified to fix performance in cases where bins are not dominated by a single template

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New features
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- New cost function ``cost.BarlowBeestonLite`` for template fits with correct uncertainty propagation for templates obtained from simulation or sWeighted data, written together with AhmedAbdelmotteleb
- Formerly private chi2 utility cost functions (``cost.poisson_chi2``, etc.), are now part of public API
- Support custom grid in ``Minuit.profile``, ``iminuit.mncontour``, ``iminuit.contour``
- Handle common CL values in ``Minuit.mnprofile`` and ``Minuit.mncontour`` without scipy

Fixes
~~~~~
- Skip tests that use ``np.float128`` on platforms where this type is not supported
- ``Minuit.valid`` now returns ``False`` if EDM is NaN
- ``subtract_min`` setting is no longer ignored by ``Minuit.draw_contour``

Documentation
~~~~~~~~~~~~~
- New study about template fits

Other
~~~~~
- ``Minuit`` no longer warns when a function is used that has no ``errordef``
attribute and ``Minuit.errordef`` is not explicitly set. The function is
assumed to be chi-square-like up to an arbitrary constant, unless ``errordef``
is explicitly set to something else.
- More type correctness in API, better hiding of private objects in library
- Option to use external pybind11, by henryiii
- Update to pybind11-v2.9.2, by henryiii
- Update to root-v6-25-02 plus our patches
- Several minor cleanups and internal tool updates, by henryiii