Checkstyle fix

Author: garyrussell

spring-integration-core/src/test/java/org/springframework/integration/dsl/correlation/CorrelationHandlerTests.java

@@ -56,7 +56,6 @@
 
 import com.fasterxml.jackson.databind.node.ArrayNode;
 import com.fasterxml.jackson.databind.node.TextNode;
-
 import reactor.core.publisher.Flux;
 import reactor.test.StepVerifier;