Update munit to 1.2.4 in 0.11.x #3069

Job	Run time
conformance	46s
build (2_13, e2e)	43s
build (2_12, test)	55s
build (3, mima)	9s
build (2_13, mima)	45s
build (2_12, mima)	41s
build (2_13, test)	56s
build (3, scala3_compat_test)	49s
build (2_12, e2e)	43s
build (3, test)	56s
build (2_12, examples_and_formatting)	56s
build (2_13, scala3_compat_test)	51s
build (3, e2e)	44s
ci-passed	-1s
	9m 53s

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