Please update anyio dependency to 4.x

[lulingar]

On moat 0.39.8 (the current latest available on pip, despite the 0.40.0 release already available on GitHub), I have ran into errors like:

../../../.virtualenvs/throwaway/lib/python3.11/site-packages/anyio/_backends/_trio.py:164: in <module>
    class ExceptionGroup(BaseExceptionGroup, trio.MultiError):
../../../.virtualenvs/throwaway/lib/python3.11/site-packages/trio/_deprecate.py:153: in __getattr__
    raise AttributeError(msg.format(self.__name__, name))
E   AttributeError: module 'trio' has no attribute 'MultiError'

which have gone away just by doing pip install -U anyio. Please update the version compatibility for moat-mqtt.

[smurfix]

While I can and will upload 0.40.1 shortly, the problem doesn't originate with moat-mqtt. The root cause is the fact that trio's version numbering scheme doesn't follow Semantic Versioning guidelines, thus some Trio upgrade happened to break your anyio package.

I'll probably have to start a discussion about that on the Trio issue tracker.