chore(deps): bump jupyter-server in /modules/kernels/nix

Bumps [jupyter-server](https://github.com/jupyter-server/jupyter_server) from 1.21.0 to 2.7.2.
- [Release notes](https://github.com/jupyter-server/jupyter_server/releases)
- [Changelog](https://github.com/jupyter-server/jupyter_server/blob/main/CHANGELOG.md)
- [Commits](jupyter-server/jupyter_server@v1.21.0...v2.7.2)

---
updated-dependencies:
- dependency-name: jupyter-server
  dependency-type: indirect
...

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