fix(llm): 重置 Unirest 配置以避免内存泄漏

- 在更新知识库时添加了 Unirest 配置重置操作
- 确保每次请求后都重新设置 Unirest 配置，防止潜在的内存泄漏问题

yudao-module-llm/yudao-module-llm-biz/src/main/java/cn/iocoder/yudao/module/llm/service/knowledgebase/KnowledgeBaseServiceImpl.java

@@ -72,6 +72,7 @@ public class KnowledgeBaseServiceImpl implements KnowledgeBaseService {
         KnowledgeBaseDO updateObj = BeanUtils.toBean(updateReqVO, KnowledgeBaseDO.class);
         knowledgeBaseMapper.updateById(updateObj);
 
+        Unirest.config().reset();
         Unirest.config()
                 .socketTimeout(86400000)
                 .connectTimeout(100000)