Update munit-scalacheck to 1.2.0 in 0.11.x (#1962) #2880

Job	Run time
conformance	1m 52s
build (2_12, mima)	1m 31s
build (2_12, test)	12m 20s
build (2_13, e2e)	4m 5s
build (2_13, mima)	1m 33s
build (2_12, e2e)	3m 40s
build (3, mima)	11s
build (3, scala3_compat_test)	9m 46s
build (2_12, examples_and_formatting)	3m 4s
build (2_13, test)	12m 45s
build (2_13, scala3_compat_test)	7m 25s
build (3, e2e)	4m 45s
build (3, test)	11m 20s
ci-passed	4s
	1h 14m 21s

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