test_logger fails on linux/python3.9 as part of IGWN Conda integration tests

The test/test_logging.py::test_logger test function is failing repeatedly on Linux only on python3.9 when run as part of the IGWN Conda Distribution [ref]:

        # Check results - there must be something weird with threading going on
        # since if we don't sleep here, mock_write_log.call_args returns as None
        time.sleep(0.01)
>       call_args, call_kwargs = mock_write_log.call_args
E       TypeError: cannot unpack non-iterable NoneType object
../../../envs/igwn-py39-testing/lib/python3.9/site-packages/ligo/gracedb/test/test_logging.py:37: TypeError

It looks like the time.sleep just isn't long enough, or for some other reason the log isn't actually being emitted. I can't reproduce this outside of that environment.

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