pytest-tornasync is dead upstream and pytest-jupyter contains some of its important pieces so you no longer need it, see jupyter-server/pytest-jupyter@10cf9ca

Also, jupyter-server-terminals already switched and it seems to be easy, see jupyter-server/jupyter_server_terminals@7444512

This change will happen across the entire Jupyter ecosystem sooner or later, see for example jupyterlab/jupyterlab#13794

My motivation for this request is that I'm trying to package Jupyter Lab and the latest Notebook into Fedora Linux and packaging unmaintained projects like tornasync is a bad idea.