Bump jupyterlab from 1.2.21 to 3.6.8

Bumps [jupyterlab](https://github.com/jupyterlab/jupyterlab) from 1.2.21 to 3.6.8.
- [Release notes](https://github.com/jupyterlab/jupyterlab/releases)
- [Changelog](https://github.com/jupyterlab/jupyterlab/blob/main/CHANGELOG.md)
- [Commits](https://github.com/jupyterlab/jupyterlab/commits/@jupyterlab/[email protected])

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

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

requirements.txt

@@ -1,5 +1,5 @@
 ipykernel==5.1.0
-jupyterlab==1.2.21
+jupyterlab==3.6.8
 #jupyterlab==1.0.1
 # OWSLib requires python-dev
 OWSLib==0.17.0