Bump notebook from 6.1.1 to 6.4.1

Bumps [notebook](https://github.com/jupyter/jupyterhub) from 6.1.1 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: direct:production
...

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

Author: dependabot[bot]

requirementsALL.txt

@@ -31,7 +31,7 @@ matplotlib==3.3.0
 model==0.6.0
 newspaper==0.1.0.7
 nltk==3.5
-notebook==6.1.1
+notebook==6.4.1
 numpy==1.19.1
 opencv-python==4.3.0.36
 pandas==1.0.5