chore: change version to 5.2.0-SNAPSHOT (#2995) #5749

Job	Run time
sample_operators_tests (sample-operators/leader-election)	4m 33s
sample_operators_tests (sample-operators/mysql-schema)	3m 53s
sample_operators_tests (sample-operators/webpage)	3m 48s
sample_operators_tests (sample-operators/tomcat-operator)	3m 38s
	15m 52s

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