Dispose asyncio.ProactorEventLoop() when finish

Question

I'm running an automation tests with pytest. One of the first tests is updating Python packages. From time to time the subprocess stuck on subprocess.stdout.readline() So, I tried another solution I found using asyncio.ProactorEventLoop() It seems to work as expected but it is endless logging "Using proactor: IocpProactor". How do I disable this logging or alternatively, subprocess.stdout.readline() with working timeout (I have tried using Timer but it does not help since stdout.readline() is stuck)

def run_python_process(cmd: List[str], timeout: int, show_logs=True, logger=None):
    if not show_logs:
        logger = None
    elif not logger:
        logger = logging.getLogger()

    if sys.platform == "win32":
        loop = asyncio.ProactorEventLoop()  # For subprocess' pipes on Windows
        asyncio.set_event_loop(loop)
    else:
        loop = asyncio.get_event_loop()

    return_code, stdout = loop.run_until_complete(run_command(' '.join(cmd), timeout=timeout, logger=logger))

    loop.close()
    return CompletedProcess([], return_code, stdout, None)


async def run_command(cmd, timeout=None, logger=None):
    # Start child process
    # NOTE: universal_newlines parameter is not supported
    process = await asyncio.create_subprocess_shell(cmd, stdout=PIPE, stderr=STDOUT)
    stdout = ''
    # Read line (sequence of bytes ending with b'\n') asynchronously
    while True:
        try:
            line = await asyncio.wait_for(process.stdout.readline(), timeout)
        except asyncio.TimeoutError:
            pass
        else:
            if not line:  # EOF
                break
            else:
                d_line = line.decode('ascii')
                stdout += d_line
                if logger:
                    logger.info(d_line.strip())
                continue  # While some criterium is satisfied
        process.kill()  # Timeout or some criterion is not satisfied
        break
    return await process.wait(), stdout  # Wait for the child process to exit

IocpProactor logging