Update mockito-core to 5.20.0 in 0.11.x (#1969) #2858

Job	Run time
conformance	2m 4s
build (2_13, test)	10m 21s
build (2_12, test)	14m 4s
build (2_12, mima)	1m 29s
build (2_13, e2e)	4m 3s
build (2_13, mima)	1m 28s
build (2_12, e2e)	3m 25s
build (3, e2e)	4m 19s
build (3, test)	11m 9s
build (3, mima)	9s
build (3, scala3_compat_test)	8m 11s
build (2_13, scala3_compat_test)	7m 34s
build (2_12, examples_and_formatting)	3m 12s
ci-passed	4s
	1h 11m 32s

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