docs: blog about 5.2 release (#3063) #5959

Job	Run time
sample_operators_tests (sample-operators/tomcat-operator)	3m 43s
sample_operators_tests (sample-operators/webpage)	3m 33s
sample_operators_tests (sample-operators/mysql-schema)	3m 41s
sample_operators_tests (sample-operators/leader-election)	3m 54s
	14m 51s

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