Bump mysql-connector-java in /lab-12-mybatis/lab-12-mybatis-annotation

Bumps [mysql-connector-java](https://github.com/mysql/mysql-connector-j) from 5.1.48 to 8.0.28.
- [Changelog](https://github.com/mysql/mysql-connector-j/blob/release/8.0/CHANGES)
- [Commits](mysql/mysql-connector-j@5.1.48...8.0.28)

---
updated-dependencies:
- dependency-name: mysql:mysql-connector-java
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

lab-12-mybatis/lab-12-mybatis-annotation/pom.xml

@@ -21,7 +21,7 @@
         <dependency> <!-- 本示例，我们使用 MySQL -->
             <groupId>mysql</groupId>
             <artifactId>mysql-connector-java</artifactId>
-            <version>5.1.48</version>
+            <version>8.0.28</version>
         </dependency>
 
         <!-- 实现对 MyBatis 的自动化配置 -->