Bump certifi from 2021.5.30 to 2022.12.7 in /docs

Bumps [certifi](https://github.com/certifi/python-certifi) from 2021.5.30 to 2022.12.7.
- [Release notes](https://github.com/certifi/python-certifi/releases)
- [Commits](certifi/python-certifi@2021.05.30...2022.12.07)

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

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

docs/requirements.txt

@@ -13,7 +13,7 @@ bleach==3.3.0
 brotlipy==0.7.0
 bump2version==0.5.11
 cachetools==4.2.2
-certifi==2021.5.30
+certifi==2022.12.7
 cffi==1.14.6
 cfgv==3.3.0
 chardet==4.0.0