Update jupyterlab requirement from ~=4.1.5 to ~=4.2.0

Updates the requirements on [jupyterlab](https://github.com/jupyterlab/jupyterlab) to permit the latest version.
- [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/lsp@4.1.5...@jupyterlab/lsp@4.2.0)

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

Signed-off-by: dependabot[bot] <support@github.com>

docs/requirements.txt

@@ -6,7 +6,7 @@ sphinxcontrib-napoleon~=0.7
 plantweb~=1.2.1
 sphinxcontrib-programoutput~=0.17
 nbsphinx~=0.9.3
-jupyterlab~=4.1.5
+jupyterlab~=4.2.0
 myst-parser~=2.0.0
 readthedocs-sphinx-search~=0.3.2
 sphinx-copybutton~=0.5.2