flake8-async CI

add asyncio/anyio taskgroup support to async111&112, update contributing.md #668

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Job	Run time
pyright	15s
slow_tests	12m 38s
test (3.9)	2m 28s
test (3.10)	2m 35s
test (3.11)	2m 22s
test (3.12)	2m 56s
test (3.13-dev)	4m 39s
release	0s
	27m 53s