Include 3.12 in CI and upgrade actions version #150

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Run time

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Job	Run time
lint	17s
test (3.7)	40s
test (3.8)	29s
test (3.9)	27s
test (3.10)	28s
test (3.11)	29s
test (3.12)	50s
release	0s
	3m 40s