Fix import for JavaUtils

**Cherry-pick to `5.3.x`**

Author: artembilan

spring-integration-ws/src/main/java/org/springframework/integration/ws/dsl/MarshallingWsOutboundGatewaySpec.java

@@ -18,7 +18,7 @@
 
 import java.util.Arrays;
 
-import org.springframework.integration.JavaUtils;
+import org.springframework.integration.util.JavaUtils;
 import org.springframework.integration.ws.MarshallingWebServiceOutboundGateway;
 import org.springframework.oxm.Marshaller;
 import org.springframework.oxm.Unmarshaller;

spring-integration-ws/src/main/java/org/springframework/integration/ws/dsl/SimpleWsOutboundGatewaySpec.java

@@ -18,7 +18,7 @@
 
 import java.util.Arrays;
 
-import org.springframework.integration.JavaUtils;
+import org.springframework.integration.util.JavaUtils;
 import org.springframework.integration.ws.SimpleWebServiceOutboundGateway;
 import org.springframework.ws.WebServiceMessageFactory;
 import org.springframework.ws.client.core.FaultMessageResolver;