Update dependency @jupyterlab/application to v4

Author: renovate[bot]

extensions/jupyterlab/package.json

@@ -31,7 +31,7 @@
     "watch": "tsc -w"
   },
   "dependencies": {
-    "@jupyterlab/application": "^2.0.0 || ^3.0.0",
+    "@jupyterlab/application": "^2.0.0 || ^3.0.0 || ^4.0.0",
     "@jupyterlab/notebook": "^2.0.0 || ^3.0.0",
     "@jupyterlab/console": "^2.0.0 || ^3.0.0"
   },