Bump certifi from 2022.12.7 to 2023.7.22 in /backend

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: indirect
...

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

Author: dependabot[bot]

backend/requirements.txt

@@ -20,7 +20,7 @@ billiard==3.6.4.0
     # via celery
 celery==5.2.2
     # via -r requirements.in
-certifi==2022.12.7
+certifi==2023.7.22
     # via
     #   elasticsearch
     #   requests