Bump jupyterlab from 0.35.4 to 1.2.21
Bump jupyterlab from 0.35.4 to 1.2.21

Bumps [jupyterlab](https://github.com/jupyterlab/jupyterlab) from 0.35.4 to 1.2.21.
- [Release notes](https://github.com/jupyterlab/jupyterlab/releases)
- [Changelog](https://github.com/jupyterlab/jupyterlab/blob/master/CHANGELOG.md)
- [Commits](https://github.com/jupyterlab/jupyterlab/commits)

---
updated-dependencies:
- dependency-name: jupyterlab
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <5bdcd3c0d4d24ae3e71b3b452a024c6324c7e4bb@github.com>
suresh/notebooks,suresh/notebooks