Bump jupyterlab from 3.6.7 to 3.6.8 in /netdata-pandas-examples

Bumps [jupyterlab](https://github.com/jupyterlab/jupyterlab) from 3.6.7 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:production
...

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

netdata-pandas-examples/requirements.txt

@@ -1,6 +1,6 @@
 netdata-pandas==0.0.33
 jupyter==1.0.0
-jupyterlab==3.6.7
+jupyterlab==3.6.8
 adtk==0.6.2
 seaborn==0.11.0
 numba==0.50.1