Update dependency @jupyterlab/notebook to v4

Author: renovate[bot]

extensions/jupyterlab/package.json

@@ -32,7 +32,7 @@
   },
   "dependencies": {
     "@jupyterlab/application": "^2.0.0 || ^3.0.0",
-    "@jupyterlab/notebook": "^2.0.0 || ^3.0.0",
+    "@jupyterlab/notebook": "^2.0.0 || ^3.0.0 || ^4.0.0",
     "@jupyterlab/console": "^2.0.0 || ^3.0.0"
   },
   "devDependencies": {