Start building against Spring AMQP 2.2.6 snapshots

See gh-20946

Author: snicoll

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

@@ -186,7 +186,7 @@
 		<slf4j.version>1.7.30</slf4j.version>
 		<snakeyaml.version>1.25</snakeyaml.version>
 		<solr.version>8.2.0</solr.version>
-		<spring-amqp.version>2.2.5.RELEASE</spring-amqp.version>
+		<spring-amqp.version>2.2.6.BUILD-SNAPSHOT</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-SR6</spring-data-releasetrain.version>