Log Message:
py-cython: updated to 0.29.24

0.29.24

Bugs fixed
* Inline functions in pxd files that used memory views could lead to invalid
  C code if the module that imported from them does not use memory views.
* Several declarations in ``libcpp.string`` were added and corrected.
* Pickling unbound Cython compiled methods failed.
* The tracing code was adapted to work with CPython 3.10.
* The optimised ``in`` operator failed on unicode strings in Py3.9 and later
  that were constructed from an external ``wchar_t`` source.
  Also, related C compiler warnings about deprecated C-API usage were resolved.
* Some compiler crashes were resolved.
* An incorrect warning about 'unused' generator expressions was removed.
* The attributes ``gen.gi_frame`` and ``coro.cr_frame`` of Cython compiled
  generators and coroutines now return an actual frame object for introspection,
  instead of ``None``.