Bump certifi from 2022.12.7 to 2023.7.22 in /docs

Bumps [certifi](https://github.com/certifi/python-certifi) from 2022.12.7 to 2023.7.22.
- [Commits](https://github.com/certifi/python-certifi/compare/2022.12.07...2023.07.22)

---
updated-dependencies:
- dependency-name: certifi
  dependency-type: indirect
...

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

docs/requirements.txt

@@ -8,7 +8,7 @@ alabaster==0.7.13
     # via sphinx
 babel==2.11.0
     # via sphinx
-certifi==2022.12.7
+certifi==2023.7.22
     # via requests
 charset-normalizer==3.0.1
     # via requests