Make reading the request body work in Django ASGI apps. #3978

Job	Run time
rq, python 3.5, ubuntu-20.04	6m 40s
rq, python 2.7, ubuntu-20.04	5m 21s
rq, python 3.6, ubuntu-20.04	4m 42s
rq, python 3.7, ubuntu-20.04	2m 40s
rq, python 3.8, ubuntu-20.04	2m 42s
rq, python 3.9, ubuntu-20.04	2m 44s
rq, python 3.10, ubuntu-20.04	1m 1s
rq, python 3.11, ubuntu-20.04	1m 27s
rq, python 3.12, ubuntu-20.04	1m 13s
All rq tests passed or skipped	1s
	28m 31s

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