BUILD: Update cffi requirement from <1.17,>=1.16.0 to >=1.16.0,<1.18

[dependabot]

Updates the requirements on cffi to permit the latest version.

Release notes

Sourced from cffi's releases.

v1.17.0

• Add support for Python 3.13.
  • Free-threaded CPython builds (i.e. python3.13t and the 3.13t ABI) are not currently supported.
• 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 <cdata> 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 <cdata> 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.

Full Changelog: python-cffi/cffi@v1.16.0...v1.17.0

Commits

• 74731f9 Release 1.17.0 (#108)
• 181fa00 1.17.0rc1 release (#80)
• 772528e Add 3.13 to trove classifiers (#72)
• e36042d 1.17.0b1 prep (#79)
• 39bdab2 avoid null-pointer-subtraction error (#78)
• d7f750b Mention the systemd issue with old-style callbacks (#74)
• 56f7609 Build aarch64 musllinux wheel (#69)
• e59ec8f Win32: pass the flags from dlopen() to LoadLibraryEx() (#65)
• 0619e5e remove binary cruft (#63)
• 640e89f rearrange code to make PyPy testing happier (#59)
• Additional commits viewable in compare view

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