Dependencies: Update requirements for kiwipy and plumpy

[sphuber]

The new version kiwipy==0.8 and plumpy==0.22 provide compatiblity with newer versions of aio-pika==9.0 which comes with various connection stability improvements.

[sphuber]

There is a single bug that prevents this from being merged. Once the RmqCommunicator has opened a channel (which is done as soon as a process is run, for example a calcfunction) the close() call will hang. We have traced the source to the finished attribute of aio_pika.OneShotCallBack (which is an asyncio.Event) never being set. It is set when the OneShotCallBack is called (see the __call__ method which calls __task_inner whichs sets the finished event), but this is never called. We noticed that the channel, which is closed before the connection, had an exception during the close callbacks. We couldn't figure out which exception (seemed empty) or where it had been raised, but it may have a knock-on effect on the closing of the connection. Finally, if we disable nest_asyncio, the problem disappears, so it may be related to nest_asyncio as well. Unfortunately we currently cannot get rid of nest_asyncio as we need it to be able to call processes from within processes, i.e., to have a workfunction call a calcfunction.