Make sure jupyterhub_singleuser is installed.

Author: mike-matera

pyproject.toml

@@ -7,6 +7,7 @@ requires-python = ">=3.12"
 dependencies = [
     "ipycanvas>=0.13.3",
     "jupyter-turtle",
+    "jupyterhub>=5.3.0",
     "jupyterlab>=4.4.3",
     "matplotlib>=3.10.3",
     "nbquiz",