Update munit-scalacheck to 1.2.0 in 0.11.x (#1962) #2861

Job	Run time
conformance	4m 2s
build (3, test)	8m 26s
build (3, scala3_compat_test)	8m 21s
build (2_12, test)	12m 13s
build (3, e2e)	4m 22s
build (2_12, mima)	1m 17s
build (3, mima)	8s
build (2_13, test)	11m 24s
build (2_13, scala3_compat_test)	8m 22s
build (2_13, mima)	1m 11s
build (2_13, e2e)	3m 53s
build (2_12, examples_and_formatting)	2m 43s
build (2_12, e2e)	3m 18s
ci-passed	3s
	1h 9m 43s

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