Update dependency cffi to v2

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
cffi (changelog)	==1.17.1 → ==2.0.0

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Release Notes

python-cffi/cffi (cffi)

v2.0.0

Compare Source

What's Changed

• Add Python 3.14 support.
• Add CPython free-threaded support (3.14t+ only) - huge thanks to the folks at Quansight Labs for all the work to get this one sorted!
• Drop Python <= 3.8 support.
• Fix order dependency affecting nested type size calculation (#​148).

Full Changelog: python-cffi/cffi@v1.17.1...v2.0.0

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