Revert "Start building against Spring AMQP 2.0 snapshots"

This reverts commit d6a3238e7d.

See gh-9289

spring-boot-dependencies/pom.xml

@@ -152,7 +152,7 @@
 		<snakeyaml.version>1.18</snakeyaml.version>
 		<solr.version>6.5.1</solr.version>
 		<spring.version>5.0.0.BUILD-SNAPSHOT</spring.version>
-		<spring-amqp.version>2.0.0.BUILD-SNAPSHOT</spring-amqp.version>
+		<spring-amqp.version>2.0.0.M4</spring-amqp.version>
 		<spring-cloud-connectors.version>2.0.0.M1</spring-cloud-connectors.version>
 		<spring-batch.version>4.0.0.M2</spring-batch.version>
 		<spring-data-releasetrain.version>Kay-BUILD-SNAPSHOT</spring-data-releasetrain.version>