gh-35084: build/pkgs/cython: Update to 0.29.36
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### ๐ Description
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Update to latest in 0.x series
https://cython.readthedocs.io/en/latest/src/changes.html#id35
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Preparation for Python 3.12
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Fixes #34897
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URL: https://github.com/sagemath/sage/pull/35084
Reported by: Matthias Kรถppe
Reviewer(s): Dima Pasechnik
