fix: undo last minute edit and try to get make checkin clean. Fixed admin.py. Change # noqa: 821 to # noqa: F821 to make ruff ignore undefined variable in the python 2 branch of the code. Hopefully the flake8 run in CI will accept the change from 821 to F821 and not error with an undefined variable.

try:
    # Python 3+.
    from xmlrpc import client, server
    server.SimpleXMLRPCDispatcher
except (ImportError, AttributeError):
    # Python 2.
    import xmlrpclib as client  # noqa: F401
    import SimpleXMLRPCServer as server