Bump mysql-connector-java in /springboot-transactional

Bumps [mysql-connector-java](https://github.com/mysql/mysql-connector-j) from 5.1.44 to 8.0.28.
- [Release notes](https://github.com/mysql/mysql-connector-j/releases)
- [Changelog](https://github.com/mysql/mysql-connector-j/blob/release/8.0/CHANGES)
- [Commits](mysql/mysql-connector-j@5.1.44...8.0.28)

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

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

springboot-transactional/pom.xml

@@ -48,7 +48,7 @@
 	  <dependency>
 		  <groupId>mysql</groupId>
 		  <artifactId>mysql-connector-java</artifactId>
-		  <version>5.1.44</version>
+		  <version>8.0.28</version>
 	  </dependency>
 	  <!-- Druid 数据连接池依赖 -->
 	  <dependency>