Upgrade to Spring Framework 5.2.0.RC2

Closes gh-17896

spring-boot-project/spring-boot-dependencies/pom.xml

@@ -187,7 +187,7 @@
 		<spring-batch.version>4.2.0.BUILD-SNAPSHOT</spring-batch.version>
 		<spring-cloud-connectors.version>2.0.6.RELEASE</spring-cloud-connectors.version>
 		<spring-data-releasetrain.version>Moore-BUILD-SNAPSHOT</spring-data-releasetrain.version>
-		<spring-framework.version>5.2.0.BUILD-SNAPSHOT</spring-framework.version>
+		<spring-framework.version>5.2.0.RC2</spring-framework.version>
 		<spring-hateoas.version>1.0.0.BUILD-SNAPSHOT</spring-hateoas.version>
 		<spring-integration.version>5.2.0.BUILD-SNAPSHOT</spring-integration.version>
 		<spring-kafka.version>2.3.0.BUILD-SNAPSHOT</spring-kafka.version>