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Update README build badge #4

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Job	Run time
tests (3.10)	28s
tests (3.8)	52s
tests (3.9)	29s
tests (3.11)	28s
tests (3.13)	28s
tests (3.14)	27s
tests (3.12)	33s
tests (pypy-3.9)	40s
	4m 25s