build(deps): bump requests in /images/singleuser-sample

Bumps [requests](https://github.com/psf/requests) from 2.30.0 to 2.31.0.
- [Release notes](https://github.com/psf/requests/releases)
- [Changelog](https://github.com/psf/requests/blob/main/HISTORY.md)
- [Commits](psf/requests@v2.30.0...v2.31.0)

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

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

Author: dependabot[bot]

images/singleuser-sample/requirements.txt

@@ -264,7 +264,7 @@ pyzmq==25.0.2
     #   jupyter-server
     #   nbclassic
     #   notebook
-requests==2.30.0
+requests==2.31.0
     # via
     #   jupyterhub
     #   jupyterlab-server