[autoupdate] Update Cython from 3.0.7 to 3.0.8

[isc-adang]

A new version of Cython is available.

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

3.0.8 (2024-01-10)

Bugs fixed

• Using const together with defined fused types could fail to compile. (Github issue #5230)

• A “use after free” bug was fixed in parallel sections. (Github issue #5922)

• Several types were not available as cython.* types in pure Python code.

• The generated code is now correct C89 again, removing some C++ style // comments and C99-style declaration-after-code code ordering. This is still relevant for some ols C compilers, specifically ones that match old Python 2.7 installations.

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