Update jupyterlab, remove workaround

hub.jupytearth.org-image/Dockerfile

@@ -197,9 +197,6 @@ RUN echo "Installing conda packages..." \
         sympy \
         #
         # temp workarounds
-        # nodjs installed to help nbgitpuller build from git, which is installed
-        # as a workaround as well
-        nodejs \
  && echo "Installing conda packages complete!"
 
 
@@ -222,9 +219,6 @@ RUN echo "Installing pip packages..." \
             #       conda-forge. We have also installed TurboVNC for performance
             #       I think, and also various apt packages to get a desktop UI.
             #
-        https://github.com/jupyterhub/nbgitpuller/archive/main.zip \
-            # We want the unreleased version to avoid an issue with use of
-            # jupyter_server. We need something later than version 0.10.2.
         julia \
             # To enable doing Julia stuff from Python
             # ref: https://pyjulia.readthedocs.io/en/latest/index.html