chore(deps): bump org.mockito:mockito-core from 5.20.0 to 5.21.0 #6025

Job	Run time
sample_operators_tests (sample-operators/mysql-schema)	3m 33s
sample_operators_tests (sample-operators/tomcat-operator)	3m 52s
sample_operators_tests (sample-operators/webpage)	3m 41s
sample_operators_tests (sample-operators/leader-election)	3m 49s
	14m 55s

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