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](certifi/python-certifi@2022.12.07...2023.07.22)

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

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

docs/requirements.txt

@@ -3,7 +3,7 @@ Babel==2.9.1
 beautifulsoup4==4.8.1
 breathe==4.13.1
 bs4==0.0.1
-certifi==2022.12.7
+certifi==2023.7.22
 chardet==3.0.4
 docutils==0.15.2
 exhale==0.2.3