GH-2456: (Re) Support Spring Framework 5.2 (#2530)

The framework is intended for use with Spring Framework 5.3.

However, this change was the only thing preventing it being used
with 5.2.

spring-rabbit/src/main/java/org/springframework/amqp/rabbit/annotation/RabbitListenerAnnotationBeanPostProcessor.java

@@ -320,6 +320,9 @@ private TypeMetadata buildMetadata(Class<?> targetClass) {
 		final List<ListenerMethod> methods = new ArrayList<>();
 		final List<Method> multiMethods = new ArrayList<>();
 		ReflectionUtils.doWithMethods(targetClass, method -> {
+			if (method.getDeclaringClass().getName().contains("$MockitoMock$")) {
+				return;
+			}
 			List<RabbitListener> listenerAnnotations = findListenerAnnotations(method);
 			if (listenerAnnotations.size() > 0) {
 				methods.add(new ListenerMethod(method,
@@ -331,8 +334,7 @@ private TypeMetadata buildMetadata(Class<?> targetClass) {
 					multiMethods.add(method);
 				}
 			}
-		}, ReflectionUtils.USER_DECLARED_METHODS
-				.and(meth -> !meth.getDeclaringClass().getName().contains("$MockitoMock$")));
+		}, ReflectionUtils.USER_DECLARED_METHODS);
 		if (methods.isEmpty() && multiMethods.isEmpty()) {
 			return TypeMetadata.EMPTY;
 		}