Bump cffi from 1.14.1 to 1.14.2 in /requirements (#15306)
Bump cffi from 1.14.1 to 1.14.2 in /requirements (#15306)

Bumps [cffi](https://github.com/python-cffi/release-doc) from 1.14.1 to 1.14.2.
- [Release notes](https://github.com/python-cffi/release-doc/releases)
- [Commits](https://github.com/python-cffi/release-doc/commits)

Signed-off-by: dependabot[bot] <5bdcd3c0d4d24ae3e71b3b452a024c6324c7e4bb@github.com>

Co-authored-by: dependabot[bot] <1c358da00a777d4e9898c1280ab801e2df165188@users.noreply.github.com>
mozilla/olympia,mozilla/addons-server,mozilla/addons-server,bqbn/addons-server,mozilla/addons-server,bqbn/addons-server,bqbn/addons-server,wagnerand/addons-server,diox/olympia,eviljeff/olympia,eviljeff/olympia,diox/olympia,mozilla/olympia,bqbn/addons-server,mozilla/olympia,diox/olympia,wagnerand/addons-server,mozilla/addons-server,mozilla/olympia,diox/olympia,eviljeff/olympia,eviljeff/olympia,wagnerand/addons-server,wagnerand/addons-server