fix: install jupyterlab to provide jlpm command in spell-check CI

The Base Setup action provides Python and yarn but not jlpm. Installing
jupyterlab via pip provides the jlpm command, following the pattern used
in build.yml.

Author: devin-ai-integration[bot]

.github/workflows/ci.yaml

@@ -21,6 +21,9 @@ jobs:
       - name: Base Setup
         uses: jupyterlab/maintainer-tools/.github/actions/base-setup@v1
 
+      - name: Install JupyterLab
+        run: python -m pip install -U "jupyterlab>=4.0.0,<5"
+
       - name: Install dependencies
         run: jlpm
         env: