Bump cffi from 2.1.0 to 2.1.1 in /requirements

Bumps [cffi](https://github.com/python-cffi/cffi) from 2.1.0 to 2.1.1.
- [Release notes](https://github.com/python-cffi/cffi/releases)
- [Commits](python-cffi/cffi@v2.1.0...v2.1.1)

---
updated-dependencies:
- dependency-name: cffi
  dependency-version: 2.1.1
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

Author: dependabot[bot]

requirements/base.txt

@@ -1,5 +1,5 @@
 # What we want
-cffi==2.1.0
+cffi==2.1.1
 
 # What we need
 pycparser==3.0