Start building against Spring Integration snapshots

See gh-14330

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

@@ -157,7 +157,7 @@
 		<spring-cloud-connectors.version>2.0.2.RELEASE</spring-cloud-connectors.version>
 		<spring-data-releasetrain.version>Kay-BUILD-SNAPSHOT</spring-data-releasetrain.version>
 		<spring-hateoas.version>0.25.0.RELEASE</spring-hateoas.version>
-		<spring-integration.version>5.0.7.RELEASE</spring-integration.version>
+		<spring-integration.version>5.0.8.BUILD-SNAPSHOT</spring-integration.version>
 		<spring-kafka.version>2.1.8.RELEASE</spring-kafka.version>
 		<spring-ldap.version>2.3.2.RELEASE</spring-ldap.version>
 		<spring-plugin.version>1.2.0.RELEASE</spring-plugin.version>