Merge pull request #4442 from RosettaCommons/roccomoretti/revert_nb_to_working
Revert PyRosetta.notebooks to a working state.
The current PyRosetta.notebooks master isn't actually working yet with respect to the PyRosetta4.notebook test server test. Revert the state of the submodule to a version which was, which should fix those tests in main master.
Hopefully the submodule master will be fixed/updated in the near future.