Remove coroutine decorator removed in Python 3.11

[shortbloke]

Fixed #30 coroutine decorator was deprecated in Python 3.8 and removed from Python 3.11, per: https://docs.python.org/3.10/library/asyncio-task.html#generator-based-coroutines

[shortbloke]

@glpatcern Turned out to be very simple.

[glpatcern]

Can't be so simple :-D

Jokes apart, shouldn't we replace that with an equivalent decorator for async initialization to properly work? What are other integrations doing?

[shortbloke]

Looking at other components, I don't see any additional changes being made. The code had already changed the functions to include the async prefix and there's no use of yield.

Now, that's not to say there aren't some improvements still to be made. The component takes ~100 seconds to start for me,