Update scalatest to 3.2.17 (#1571) #1870

Job	Run time
conformance	1m 55s
build (2_12, mima)	1m 30s
build (2_12, e2e)	6m 50s
build (2_12, proptest)	16m 21s
build (2_13, mima)	1m 40s
build (2_13, e2e)	4m 44s
build (2_13, proptest)	12m 23s
build (3, mima)	4s
build (3, e2e)	6m 12s
build (3, proptest)	16m 35s
build (2_12, examples_and_formatting)	3m 30s
ci-passed	1s
	1h 11m 45s

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