Start building against Spring Data Moore SR6 snapshots

See gh-20573

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

@@ -188,7 +188,7 @@
 		<spring-amqp.version>2.2.5.RELEASE</spring-amqp.version>
 		<spring-batch.version>4.2.1.RELEASE</spring-batch.version>
 		<spring-cloud-connectors.version>2.0.7.RELEASE</spring-cloud-connectors.version>
-		<spring-data-releasetrain.version>Moore-SR5</spring-data-releasetrain.version>
+		<spring-data-releasetrain.version>Moore-BUILD-SNAPSHOT</spring-data-releasetrain.version>
 		<spring-framework.version>5.2.5.BUILD-SNAPSHOT</spring-framework.version>
 		<spring-hateoas.version>1.0.3.RELEASE</spring-hateoas.version>
 		<spring-integration.version>5.2.4.RELEASE</spring-integration.version>