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Update supported python & djjango version in setup.py (#672) #234

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Job	Run time
build (3.8)	6m 46s
build (3.9)	7m 3s
build (3.10)	5m 17s
build (3.11)	3m 24s
build (pypy-3.9)	5m 54s
	28m 24s