Upgrade to Spring Integration 5.0.0.M2

Closes gh-7768

spring-boot-dependencies/pom.xml

@@ -154,7 +154,7 @@
 		<spring-batch.version>4.0.0.BUILD-SNAPSHOT</spring-batch.version>
 		<spring-data-releasetrain.version>Ingalls-BUILD-SNAPSHOT</spring-data-releasetrain.version>
 		<spring-hateoas.version>0.23.0.RELEASE</spring-hateoas.version>
-		<spring-integration.version>5.0.0.BUILD-SNAPSHOT</spring-integration.version>
+		<spring-integration.version>5.0.0.M2</spring-integration.version>
 		<spring-kafka.version>1.1.2.RELEASE</spring-kafka.version>
 		<spring-ldap.version>2.3.0.BUILD-SNAPSHOT</spring-ldap.version>
 		<spring-loaded.version>1.2.6.RELEASE</spring-loaded.version>