Bump jupyterlab from 3.6.3 to 3.6.8

Bumps [jupyterlab](https://github.com/jupyterlab/jupyterlab) from 3.6.3 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/compare/@jupyterlab/[email protected]...@jupyterlab/[email protected])

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

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

requirements-dev.txt

@@ -24,7 +24,7 @@ json5==0.9.11
 jupyter-ydoc==0.2.4
 jupyter_server_fileid==0.9.0
 jupyter_server_ydoc==0.8.0
-jupyterlab==3.6.3
+jupyterlab==3.6.8
 jupyterlab_server==2.22.1
 matplotlib-inline==0.1.6
 mccabe==0.6.1