chore(deps): bump org.mockito:mockito-core from 5.19.0 to 5.20.0 (#2955) #5591

Job	Run time
sample_operators_tests (sample-operators/tomcat-operator)	3m 27s
sample_operators_tests (sample-operators/mysql-schema)	3m 1s
sample_operators_tests (sample-operators/webpage)	3m 23s
sample_operators_tests (sample-operators/leader-election)	3m 31s
	13m 22s

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