networkx 3.3rc0 warning

https://github.com/networkx/networkx/issues/7101#issuecomment-1919737867

/usr/local/lib/python3.9/site-packages/ewokscore/events/initialize_events.py:9: in <module>
    import networkx
/usr/local/lib/python3.9/site-packages/networkx/__init__.py:20: in <module>
    from networkx.utils.backends import _dispatch
/usr/local/lib/python3.9/site-packages/networkx/utils/backends.py:135: in <module>
    backends.update(_get_backends("networkx.backends"))
/usr/local/lib/python3.9/site-packages/networkx/utils/backends.py:110: in _get_backends
    warnings.warn(
E   RuntimeWarning: networkx backend defined more than once: nx-loopback