PEP 743: Omit ``PyList_GET_ITEM``

[crusaderky]

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PyList_GET_ITEM should be treated akin to PyList_GetItem when it comes to free-threading considerations. This PR matches https://github.com/python/cpython/pull/137042.

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[encukou]

I think PEP 743 should say that Py_COMPAT_API_VERSION works with limited API (which already excludes PyList_GET_ITEM). @vstinner, would that match your intention?

[vstinner]

Right, Py_COMPAT_API_VERSION can be used with the limited C API.