Upgrade to Spring Framework 5.2.1

Closes spring-projectsgh-18733

Author: snicoll

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

@@ -189,7 +189,7 @@
 		<spring-batch.version>4.2.0.RELEASE</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>5.2.1.BUILD-SNAPSHOT</spring-framework.version>
+		<spring-framework.version>5.2.1.RELEASE</spring-framework.version>
 		<spring-hateoas.version>1.0.0.RELEASE</spring-hateoas.version>
 		<spring-integration.version>5.2.1.BUILD-SNAPSHOT</spring-integration.version>
 		<spring-kafka.version>2.3.2.BUILD-SNAPSHOT</spring-kafka.version>