sagemathgh-38501: `build/pkgs/cython`: Update to 3.0.11
    
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Various bug fixes, preparation for Python 3.13 -
https://cython.readthedocs.io/en/latest/src/changes.html#id2

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### ⌛ Dependencies

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- Depends on sagemath#38500 (merged here)
    
URL: sagemath#38501
Reported by: Matthias Köppe
Reviewer(s): Kwankyu Lee