chore: 更新数据库连接配置

- 将数据库连接地址从 localhost 修改为远程服务器地址 67.209.178.202
- 更新数据库连接密码为 123456
- 保持日志开关配置不变

demo4/src/main/resources/application.yml

@@ -5,7 +5,7 @@ server:
 spring:
   datasource:
     driver-class-name: com.mysql.cj.jdbc.Driver
-    url: jdbc:mysql://localhost:3306/demo_news?characterEncoding=UTF-8&&serverTimezone=GMT
+    url: jdbc:mysql://67.209.178.202:3306/demo_news?characterEncoding=UTF-8&&serverTimezone=GMT
     username: root
     password: 135827
     type: com.alibaba.druid.pool.DruidDataSource