Update action.yml

Author: mcbarton

.github/actions/Jupyter-serve/action.yml

@@ -34,4 +34,4 @@ runs:
         # This sleep is to force enough time for the jupyter site to build before trying
         # to run notebooks in it. If you try to run the notebooks before the website is
         # ready the ci python script will crash saying ti cannot access the url
-        sleep 10
+        sleep 20