Fix Test for Latest Spring Framework 6.0

Nested runtime exception messages no longer include causes.

Author: garyrussell

build.gradle

@@ -64,7 +64,7 @@ ext {
 	reactorVersion = '2020.0.18'
 	snappyVersion = '1.1.8.4'
 	springDataVersion = '2022.0.0-M3'
-	springVersion = project.hasProperty('springVersion') ? project.springVersion : '6.0.0-M4'
+	springVersion = project.hasProperty('springVersion') ? project.springVersion : '6.0.0-SNAPSHOT'
 	springRetryVersion = '1.3.3'
 	zstdJniVersion = '1.5.0-2'
 }

spring-rabbit/src/test/java/org/springframework/amqp/rabbit/core/RabbitMessagingTemplateTests.java

@@ -211,7 +211,7 @@ protected org.springframework.amqp.core.Message createMessage(Object object,
 
 		assertThatThrownBy(() -> messagingTemplate.convertAndSend("myQueue", "msg to convert"))
 			.isExactlyInstanceOf(org.springframework.messaging.converter.MessageConversionException.class)
-			.hasMessageContaining("Test exception");
+			.hasStackTraceContaining("Test exception");
 	}
 
 	@Test