Bump certifi from 2023.5.7 to 2023.7.22 in /docs (#686)

Bumps [certifi](https://github.com/certifi/python-certifi) from 2023.5.7 to 2023.7.22.
- [Commits](certifi/python-certifi@2023.05.07...2023.07.22)

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

docs/requirements.txt

@@ -14,7 +14,7 @@ babel==2.12.1
     #   sphinx
 beautifulsoup4==4.12.2
     # via pydata-sphinx-theme
-certifi==2023.5.7
+certifi==2023.7.22
     # via requests
 charset-normalizer==3.1.0
     # via requests