Tootfinder

Thanks to @… and @…, using #CoAP is becoming more accessible: The latest version of the

I'm fixing #aiocoap's memory leak tests to finally run as async functions: the original tests employed mechanisms from the age of tulip (back when asyncio was developed out-of-tree), and Python 3.14 dropping some obsolete mechanisms.
Good riddance, but also tough work fixing subtle possible leaks that are suddenly easier to discover.