chore: bump version to 5.2.3-SNAPSHOT #6098

Job	Run time
sample_operators_tests (sample-operators/tomcat-operator)	3m 6s
sample_operators_tests (sample-operators/mysql-schema)	2m 40s
sample_operators_tests (sample-operators/leader-election)	3m 19s
sample_operators_tests (sample-operators/webpage)	3m 7s
	12m 12s

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