Bump certifi from 2018.11.29 to 2023.7.22 in /docs

Bumps [certifi](https://github.com/certifi/python-certifi) from 2018.11.29 to 2023.7.22.
- [Commits](certifi/python-certifi@2018.11.29...2023.07.22)

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

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

docs/requirements.txt

@@ -2,7 +2,7 @@ numba==0.48.0
 llvmlite==0.31.0
 asgiref>=3.2.10
 cernrequests>=0.3.0
-certifi==2018.11.29
+certifi==2023.7.22
 channels_redis
 django-allauth>=0.40.0
 django-bootstrap3>=9.1.0