Fix missed import in the HandlerAdapter

(cherry picked from commit c5d3322)

Author: artembilan

spring-kafka/src/main/java/org/springframework/kafka/listener/adapter/HandlerAdapter.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2015-2024 the original author or authors.
+ * Copyright 2015-2025 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -16,6 +16,7 @@
 
 package org.springframework.kafka.listener.adapter;
 
+import java.lang.reflect.Method;
 
 import org.springframework.core.KotlinDetector;
 import org.springframework.lang.Nullable;