Bump the actions group with 1 update (#13)

Updates the requirements on [jupyterlab](https://github.com/jupyterlab/jupyterlab) to permit the latest version.

Updates `jupyterlab` to 4.0.12
- [Release notes](https://github.com/jupyterlab/jupyterlab/releases)
- [Changelog](https://github.com/jupyterlab/jupyterlab/blob/@jupyterlab/[email protected]/CHANGELOG.md)
- [Commits](https://github.com/jupyterlab/jupyterlab/compare/@jupyterlab/[email protected]...@jupyterlab/[email protected])

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

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

demo/requirements.txt

@@ -1,6 +1,6 @@
 # Core modules (mandatory)
 jupyterlite-core==0.2.3
-jupyterlab~=4.0.11
+jupyterlab~=4.0.12
 notebook~=7.0.7
 
 # Python kernel (optional)