fix(deepresearch): fix typo

Author: jackxu2011

spring-ai-alibaba-deepresearch/src/main/java/com/alibaba/cloud/ai/example/deepresearch/model/ChatMessage.java

@@ -23,7 +23,7 @@
  * @date 2025/5/27 16:10
  */
 
-public record ChatMessage(String role, List<ContentItem> conents) {
+public record ChatMessage(String role, List<ContentItem> contents) {
 	public record ContentItem(
 			/**
 			 * 指明类型是text or image