Upgrade to Spring Data Hopper RC1

Closes gh-5150

Author: snicoll

spring-boot-dependencies/pom.xml

@@ -135,7 +135,7 @@
 		<spring-amqp.version>1.6.0.M1</spring-amqp.version>
 		<spring-cloud-connectors.version>1.2.1.RELEASE</spring-cloud-connectors.version>
 		<spring-batch.version>3.0.6.RELEASE</spring-batch.version>
-		<spring-data-releasetrain.version>Hopper-BUILD-SNAPSHOT</spring-data-releasetrain.version>
+		<spring-data-releasetrain.version>Hopper-RC1</spring-data-releasetrain.version>
 		<spring-hateoas.version>0.19.0.RELEASE</spring-hateoas.version>
 		<spring-integration.version>4.3.0.M1</spring-integration.version>
 		<spring-loaded.version>1.2.5.RELEASE</spring-loaded.version>