Bump notebook from 6.0.3 to 6.4.1 in /cp_python

Bumps [notebook](https://github.com/jupyter/jupyterhub) from 6.0.3 to 6.4.1.
- [Release notes](https://github.com/jupyter/jupyterhub/releases)
- [Changelog](https://github.com/jupyterhub/jupyterhub/blob/main/CHECKLIST-Release.md)
- [Commits](https://github.com/jupyter/jupyterhub/commits)

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

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

Author: dependabot[bot]