Bump certifi from 2019.6.16 to 2022.12.7

Bumps [certifi](https://github.com/certifi/python-certifi) from 2019.6.16 to 2022.12.7.
- [Release notes](https://github.com/certifi/python-certifi/releases)
- [Commits](https://github.com/certifi/python-certifi/compare/2019.06.16...2022.12.07)

---
updated-dependencies:
- dependency-name: certifi
  dependency-type: direct:production
...

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

docs/requirements.txt

@@ -6,7 +6,7 @@ attrs==19.1.0
 Babel==2.7.0
 black==18.9b0
 bleach==3.1.0
-certifi==2019.6.16
+certifi==2022.12.7
 chardet==3.0.4
 Click==7.0
 coverage==4.5.3