Bump jupyterhub from 5.2.0 to 5.2.1 in /pytorch in the pytorch group

Bumps the pytorch group in /pytorch with 1 update: [jupyterhub](https://github.com/jupyterhub/jupyterhub).


Updates `jupyterhub` from 5.2.0 to 5.2.1
- [Changelog](https://github.com/jupyterhub/jupyterhub/blob/main/RELEASE.md)
- [Commits](jupyterhub/jupyterhub@5.2.0...5.2.1)

---
updated-dependencies:
- dependency-name: jupyterhub
  dependency-type: direct:production
  update-type: version-update:semver-patch
  dependency-group: pytorch
...

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

Author: dependabot[bot]

pytorch/jupyter-requirements.txt

@@ -1,4 +1,4 @@
 jupyterlab==4.3.0rc0
-jupyterhub==5.2.0
+jupyterhub==5.2.1
 notebook==7.3.0b0
 jupyter-server-proxy>=4.1.2