Update mockito-core to 5.20.0 in 0.11.x #2856

Job	Run time
build (2_12, mima)	1m 26s
build (2_12, test)	10m 53s
build (2_13, mima)	1m 26s
build (2_13, scala3_compat_test)	8m 27s
build (2_12, e2e)	3m 28s
build (3, test)	8m 8s
build (3, mima)	8s
build (2_13, e2e)	4m 1s
build (2_13, test)	13m 48s
build (3, e2e)	4m 21s
build (3, scala3_compat_test)	12m 15s
build (2_12, examples_and_formatting)	2m 57s
conformance	1m 53s
ci-passed	4s
	1h 13m 15s

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