Bump jupyterhub version for security patches

https://blog.jupyter.org/open-redirect-vulnerability-in-jupyter-jupyterhub-adf43583f1e4

integration-tests/test_extensions.py

@@ -13,9 +13,9 @@ def test_serverextensions():
     ], stderr=subprocess.PIPE)
 
     extensions = [
-        'jupyterlab 0.35.3',
+        'jupyterlab 0.35.4',
         'nbgitpuller 0.6.1',
-        'nteract_on_jupyter 1.9.12',
+        'nteract_on_jupyter 2.0.7',
         'nbresuse '
     ]