Tests

New transport AIOHTTPWebsocketsTransport #706

Job	Run time
coverage	49s
build (3.7, ubuntu-20.04)	2m 26s
single_extra (aiohttp)	18s
build (3.8, ubuntu-20.04)	2m 24s
single_extra (requests)	21s
build (3.8, windows-latest)	3m 6s
single_extra (httpx)	18s
build (3.9, ubuntu-20.04)	2m 20s
single_extra (websockets)	27s
build (3.10, ubuntu-20.04)	2m 27s
single_extra (aiohttp_websockets)	11s
build (3.11, ubuntu-20.04)	2m 15s
build (3.12, ubuntu-20.04)	2m 27s
build (pypy3.8, ubuntu-20.04)	4m 21s
	24m 10s

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