Update cffi requirement in /bindings/python

Updates the requirements on [cffi](https://github.com/python-cffi/cffi) to permit the latest version.
- [Release notes](https://github.com/python-cffi/cffi/releases)
- [Commits](python-cffi/cffi@v1.12.0...v2.0.0)

---
updated-dependencies:
- dependency-name: cffi
  dependency-version: 2.0.0
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

bindings/python/requirements-test.txt

@@ -1,5 +1,5 @@
 pymongo[aws]>=4
-cffi>=1.12.0,<2
+cffi>=1.12.0,<3
 cryptography>=2
 pytest>=7.0
 unasync