[Cython] Can we remove the FastGIL implementation?

[da-woods]

On 20/09/2023 10:27, Stefan Behnel wrote:
> So – disable the feature in Python 3.11 and later? (Currently it's 
> disabled in 3.12+.)
>
That seems sensible.

I think the other question is 0.29.x. On Python 3.11+ it silently 
produces code that crashes at runtime. We should probably disable it 
there (at least if there is another 0.29.x release).

David