[stubsabot] Bump cffi to 1.17.*

[github-actions]

Release: https://pypi.org/pypi/cffi/1.17.1
Homepage: http://cffi.readthedocs.org
Repository: https://foss.heptapod.net/pypy/cffi
Typeshed stubs: https://github.com/python/typeshed/tree/main/stubs/cffi
Changelog: https://cffi.readthedocs.io/en/latest/whatsnew.html

If stubtest fails for this PR:

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• Fix stubtest failures in another PR, then close this PR

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[srittau]

From the Changelog:

In API mode, when you get a function from a C library by writing fn = lib.myfunc, you get an object of a special type for performance reasons, instead of a <cdata ‘C-function-type’>. Before version 1.17 you could only call such objects. You could write ffi.addressof(lib, “myfunc”) in order to get a real object, based on the idea that in these cases in C you’d usually write &myfunc instead of myfunc. In version 1.17, the special object lib.myfunc can now be passed in many places where CFFI expects a regular object. For example, you can now pass it as a callback to a C function call, or write it inside a C structure field of the correct pointer-to-function type, or use ffi.cast() or ffi.typeof() on it.

This sounds like it might need some changes to the stubs to accept this special object.

[srittau]

Fixed by #13653.