Merge pull request #3453 from jupyterhub/dependabot/pip/images/singleuser-sample/certifi-2024.7.4

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

Author: manics

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