chore: change version to 5.2.0-SNAPSHOT #5744

Job	Run time
sample_operators_tests (sample-operators/tomcat-operator)	3m 27s
sample_operators_tests (sample-operators/webpage)	3m 45s
sample_operators_tests (sample-operators/leader-election)	4m 10s
sample_operators_tests (sample-operators/mysql-schema)	3m 18s
	14m 40s

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