Bump @jupyterlab/docregistry from 3.2.1 to 4.2.3

Bumps [@jupyterlab/docregistry](https://github.com/jupyterlab/jupyterlab) from 3.2.1 to 4.2.3.
- [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/docregistry"
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <[email protected]>

package.json

@@ -46,7 +46,7 @@
   "dependencies": {
     "@jupyterlab/application": "^3.1.0",
     "@jupyterlab/apputils": "^3.1.0",
-    "@jupyterlab/docregistry": "^3.1.0",
+    "@jupyterlab/docregistry": "^4.2.3",
     "@jupyterlab/filebrowser": "^3.1.0",
     "@jupyterlab/notebook": "^3.1.0",
     "@lumino/disposable": "^1.4.0"