Bump certifi from 2024.6.2 to 2024.7.4 in /images/singleuser-sample

Bumps [certifi](https://github.com/certifi/python-certifi) from 2024.6.2 to 2024.7.4.
- [Commits](certifi/python-certifi@2024.06.02...2024.07.04)

---
updated-dependencies:
- dependency-name: certifi
  dependency-type: indirect
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

images/singleuser-sample/requirements.txt

@@ -32,7 +32,7 @@ beautifulsoup4==4.12.3
     # via nbconvert
 bleach==6.1.0
     # via nbconvert
-certifi==2024.6.2
+certifi==2024.7.4
     # via
     #   httpcore
     #   httpx