Bump certifi from 2022.12.7 to 2023.7.22 in /functional-tests

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]

functional-tests/requirements.txt

@@ -14,7 +14,7 @@ attrs==21.4.0
     #   packaging
     #   pytest
     #   trio
-certifi==2022.12.7
+certifi==2023.7.22
     # via urllib3
 cffi==1.15.0
     # via cryptography