cython: Update to 0.29.25 #32985
Description
https://cython.readthedocs.io/en/latest/src/changes.html#id24
CC: @orlitzky @slel @antonio-rojas
Component: packages: standard
Author: Matthias Koeppe
Branch: 8ef52be
Reviewer: François Bissey
Issue created by migration from https://trac.sagemath.org/ticket/32985