Bump certifi from 2023.5.7 to 2023.7.22 in /docs (#261)

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: direct:production
...

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

docs/requirements.txt

@@ -1,6 +1,6 @@
 alabaster==0.7.13
 Babel==2.12.1
-certifi==2023.5.7
+certifi==2023.7.22
 charset-normalizer==3.1.0
 docutils==0.19
 idna==3.4