Log Message:
py-pybind11: update to 2.13.1.

2.13.1

New Features:

    Add support for Typing.Callable[..., T]. #5202

Bug fixes:

    Avoid aligned allocation in free-threaded build in order to support macOS \ 
versions before 10.14. #5200

2.13.0

New Features:

    Support free-threaded CPython (3.13t). Add py::mod_gil_not_used() tag to \ 
indicate if a module supports running with the GIL disabled. #5148
    Support for Python 3.6 was removed. (Official end-of-life: 2021-12-23). #5177
    py::list gained a .clear() method. #5153
    Support for Union, Optional, type[T], typing.TypeGuard, typing.TypeIs, \ 
typing.Never, typing.NoReturn and typing.Literal was added to pybind11/typing.h. \ 
#5166 #5165 #5194 #5193 #5192
    In CMake, if PYBIND11_USE_CROSSCOMPILING is enabled, then \ 
CMAKE_CROSSCOMPILING will be respected and will keep pybind11 from accessing the \ 
interpreter during configuration. Several CMake variables will be required in \ 
this case, but can be deduced from the environment variable \ 
SETUPTOOLS_EXT_SUFFIX. The default (currently OFF) may be changed in the future. \ 
#5083

Bug fixes:

    A refcount bug (leading to heap-use-after-free) involving trampoline \ 
functions with PyObject * return type was fixed. #5156
    Return py::ssize_t from .ref_count() instead of int. #5139
    A subtle bug involving C++ types with unusual operator& overrides was \ 
fixed. #5189
    Support Python 3.13 with minor fix, add to CI. #5127
    Fix mistake affecting old cmake and old boost. #5149

Documentation:

    Build docs updated to feature scikit-build-core and meson-python, and \ 
updated setuptools instructions. #5168

Tests:

    Avoid immortal objects in tests. #5150

CI:

    Compile against Python 3.13t in CI.
    Use macos-13 (Intel) for CI jobs for now (will drop Python 3.7 soon). #5109
    Releases now have artifact attestations, visible at \ 
https://github.com/pybind/pybind11/attestations. #5196

Other:

    Some cleanup in preparation for 3.13 support. #5137
    Avoid a warning by ensuring an iterator end check is included in release \ 
mode. #5129
    Bump max cmake to 3.29. #5075
    Update docs and noxfile. #5071