contrib: Remove obsolete note

contrib/edhoc-demo-server.ipynb

@@ -23,7 +23,7 @@
   "cells": [
     {
       "cell_type": "markdown",
-      "source": "# Running EDHOC with the public demo server\n\nThis demo is short-lived in that it uses URIs that will not be available for long, but with the next aiocoap release, the micropip mess should become just an `await micropip.install(\"aiocoap[oscore,prettyprint]\")`.\n\nNote that the package versions and formats involved will not work on [try Jupyter](https://jupyter.org/try-jupyter/lab/) instance, but need the nightly <https://jupyterlite-pyodide-kernel.readthedocs.io/en/latest/_static/lab/index.html>",
+      "source": "# Running EDHOC with the public demo server\n\nThis demo can be run on the public Jupyter instance at [try Jupyter](https://jupyter.org/try-jupyter/lab/index.html) by uploading this file.",
       "metadata": {}
     },
     {