Bump certifi from 2020.11.8 to 2020.12.5

Bumps [certifi](https://github.com/certifi/python-certifi) from 2020.11.8 to 2020.12.5.
- [Release notes](https://github.com/certifi/python-certifi/releases)
- [Commits](certifi/python-certifi@2020.11.08...2020.12.05)

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

requirements.txt

@@ -1,4 +1,4 @@
-certifi==2020.11.8
+certifi==2020.12.5
 chardet==3.0.4
 idna==2.10
 requests==2.25.0