[stubsabot] Bump cffi to 2.1.*

Release: https://pypi.org/pypi/cffi/2.1.0
Repository: https://github.com/python-cffi/cffi/
Typeshed stubs: https://github.com/python/typeshed/tree/main/stubs/cffi
Changelog: https://cffi.readthedocs.io/en/latest/whatsnew.html
Diff: python-cffi/cffi@v2.0.0...v2.1.0

Stubsabot analysis of the diff between the two releases:
 - Total lines of Python code added: 995.
 - Total lines of Python code deleted: 489.

If stubtest fails for this PR:
- Leave this PR open (as a reminder, and to prevent stubsabot from opening another PR)
- Fix stubtest failures in another PR, then close this PR

Note that you will need to close and re-open the PR in order to trigger CI

Author: stubsabot

stubs/cffi/METADATA.toml

@@ -1,4 +1,4 @@
-version = "2.0.*"
+version = "2.1.*"
 upstream-repository = "https://github.com/python-cffi/cffi/"
 dependencies = ["types-setuptools"]