Update jupyter-client requirement from <7 to <8
Update jupyter-client requirement from <7 to <8

Updates the requirements on [jupyter-client](https://github.com/jupyter/jupyter_client) to permit the latest version.
- [Release notes](https://github.com/jupyter/jupyter_client/releases)
- [Changelog](https://github.com/jupyter/jupyter_client/blob/main/CHANGELOG.md)
- [Commits](https://github.com/jupyter/jupyter_client/compare/4.0.0...v7.2.2)

---
updated-dependencies:
- dependency-name: jupyter-client
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <5bdcd3c0d4d24ae3e71b3b452a024c6324c7e4bb@github.com>
jupyter/nbgrader,jhamrick/nbgrader,jupyter/nbgrader,jhamrick/nbgrader,jhamrick/nbgrader,jupyter/nbgrader,jupyter/nbgrader,jupyter/nbgrader,jhamrick/nbgrader