Fix CLI entrypoint to run async code under Python 3.11+

[chrifey]

Hi @danielfett,

thanks again for your work on this nice tool!

I just tried to move it to a new Raspberry Pi that is running Python 3.13 and encountered the following error when I tried to start bb_cli :

 $ bb_cli 
<coroutine object run at 0x7fb1c9ec40>
<sys>:0: RuntimeWarning: coroutine 'run' was never awaited
RuntimeWarning: Enable tracemalloc to get the object allocation traceback

The small changes in this PR seem to fix the issue and the code also works with the old Python 3.9 Version.

If you have time, I would be happy if you could review it and if you want merge.

Thanks very much in advance!
Christian