[autoupdate] Update Cython from 3.0.2 to 3.0.3

[isc-adang]

A new version of Cython is available.

Changelog (sourced from https://cython.readthedocs.io/en/latest/src/changes.html)

3.0.3 (2023-10-05)

Features added

• More warnings were added to help users migrate and avoid bugs. (Github issue #5650)

• A warning-like category for performance hints was added that bypasses -Werror. (Github issue #5673)

• FastGIL now uses standard thread_local in C++. (Github issue #5640)

• reference_wrapper was added to libcpp.functional. Patch by Vyas Ramasubramani. (Github issue #5671)

• The cythonize command now supports the --cplus option known from the cython command. (Github issue #5736)

Bugs fixed

• Performance regressions where the GIL was needlessly acquired were fixed. (Github issues #5670, #5700)

• A reference leak for exceptions in Python 3.12 was resolved. Patch by Eric Johnson. (Github issue #5724)

• fastcall calls with keyword arguments generated incorrect C code. (Github issue #5665)

• Assigning the type converted result of a conditional (if-else) expression to int or bool variables could lead to incorrect C code. (Github issue #5731)

• Early (unlikely) failures in Python function wrappers no longer set a traceback in order to simplify the C code flow. Being mostly memory allocation errors, they probably would never have created a traceback anyway. (Github issue #5681)

• Relative cimports from packages with __init__.py files could fail. (Github issue #5715)

• Several issues with the Limited API support were resolved. (Github issues #5641, #5648, #5689)

• The code generated for special-casing both Cython functions and PyCFunctions was cleaned up to avoid calling C-API functions that were not meant for the other type respectively. This could previously trigger assertions in CPython debug builds and now also plays better with the Limited API. (Github issues #4804, #5739)

• Fix some C compiler warnings. Patches by Ralf Gommers, Oleksandr Pavlyk, Sebastian Koslowski et al. (Github issues #5651, #5663, #5668, #5717, #5726, #5734)

• Generating gdb debugging information failed when using generator expressions. Patch by Oleksandr Pavlyk. (Github issue #5552)

• Passing a setuptools.Extension into cythonize() instead of a distutils.Extension could make it miss the matching extensions.

• cython -M needlessly required distutils, which made it fail in Python 3.12. (Github issue #5681)

Other changes

• The visible deprecation warning for DEF was removed again since it proved difficult for some users to migrate away from it. The statement is still meant to be removed at some point (and thus, like IF, should not be used in new code), but the time for sunset is probably not around the corner. (Github issue #4310)

• The np_pythran option raise a DeprecationWarning if it receives other values than True and False. This will eventually be disallowed (in line with all other boolean options).

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