chore: junit version bump to 6.0.1 (#3036) #5885

Job	Run time
sample_operators_tests (sample-operators/leader-election)	3m 53s
sample_operators_tests (sample-operators/tomcat-operator)	3m 31s
sample_operators_tests (sample-operators/webpage)	3m 25s
sample_operators_tests (sample-operators/mysql-schema)	3m 35s
	14m 24s

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