GH-3089: Fix import

Author: garyrussell

spring-integration-amqp/src/main/java/org/springframework/integration/amqp/dsl/AmqpBaseInboundGatewaySpec.java

@@ -16,7 +16,7 @@
 
 package org.springframework.integration.amqp.dsl;
 
-import org.springframework.amqp.rabbit.core.support.BatchingStrategy;
+import org.springframework.amqp.rabbit.batch.BatchingStrategy;
 import org.springframework.amqp.support.converter.MessageConverter;
 import org.springframework.integration.amqp.inbound.AmqpInboundGateway;
 import org.springframework.integration.amqp.support.AmqpHeaderMapper;