address checkstyle warnings

Author: msridhar

spring-messaging/src/main/java/org/springframework/messaging/tcp/TcpConnection.java

@@ -20,6 +20,7 @@
 import java.util.concurrent.CompletableFuture;
 
 import org.jspecify.annotations.Nullable;
+
 import org.springframework.messaging.Message;
 
 /**

spring-messaging/src/main/java/org/springframework/messaging/tcp/TcpOperations.java

@@ -16,9 +16,10 @@
 
 package org.springframework.messaging.tcp;
 
+import java.util.concurrent.CompletableFuture;
+
 import org.jspecify.annotations.Nullable;
 
-import java.util.concurrent.CompletableFuture;
 
 /**
  * A contract for establishing TCP connections.