Bump cffi from 1.12.3 to 1.14.4 in /tests

Bumps [cffi](https://github.com/python-cffi/release-doc) from 1.12.3 to 1.14.4.
- [Release notes](https://github.com/python-cffi/release-doc/releases)
- [Commits](https://github.com/python-cffi/release-doc/commits)

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

tests/requirements.txt

@@ -4,7 +4,7 @@ forcediphttpsadapter==1.0.1
 kubernetes==8.0.1
 pytest==6.2.2
 ipaddress==1.0.22 # >= 1.0.17
-cffi==1.12.3
+cffi==1.14.4
 pyOpenSSL==20.0.0
 certifi==2019.6.16
 urllib3==1.25.3