Upgrade to Spring Integration 5.1.0.M1

Closes gh-13891

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

@@ -158,7 +158,7 @@
 		<spring-cloud-connectors.version>2.0.2.RELEASE</spring-cloud-connectors.version>
 		<spring-data-releasetrain.version>Lovelace-RC1</spring-data-releasetrain.version>
 		<spring-hateoas.version>0.25.0.RELEASE</spring-hateoas.version>
-		<spring-integration.version>5.1.0.BUILD-SNAPSHOT</spring-integration.version>
+		<spring-integration.version>5.1.0.M1</spring-integration.version>
 		<spring-kafka.version>2.2.0.M1</spring-kafka.version>
 		<spring-ldap.version>2.3.2.RELEASE</spring-ldap.version>
 		<spring-plugin.version>1.2.0.RELEASE</spring-plugin.version>