[autoupdate] Update Cython from 0.29.24 to 0.29.25

[isc-adang]

A new version of Cython is available.

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

0.29.25 (2021-12-06)

Bugs fixed

• Several incompatibilities with CPython 3.11 were resolved. Patches by David Woods, Victor Stinner, Thomas Caswell. (Github issues #4411, #4414, #4415, #4416, #4420, #4428, #4473, #4479, #4480)

• Some C compiler warnings were resolved. Patches by Lisandro Dalcin and others. (Github issue #4439)

• C++ std::move() should only be used automatically in MSVC versions that support it. Patch by Max Bachmann. (Github issue #4191)

• The Py_hash_t type failed to accept arbitrary â��indexâ�� values. (Github issue #2752)

• Avoid copying unaligned 16-bit values since some platforms require them to be aligned. Use memcpy() instead to let the C compiler decide how to do it. (Github issue #4343)

• Cython crashed on invalid truthiness tests on C++ types without operator bool. Patch by David Woods. (Github issue #4348)

• The declaration of PyUnicode_CompareWithASCIIString() in cpython.unicode was incorrect. Patch by Max Bachmann. (Github issue #4344)

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