chore(deps): bump mysql-connector-java in /examples/spring-boot-mysql

Bumps [mysql-connector-java](https://github.com/mysql/mysql-connector-j) from 8.0.24 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@8.0.24...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]

examples/spring-boot-mysql/pom.xml

@@ -31,7 +31,7 @@
 		<dependency>
 			<groupId>mysql</groupId>
 			<artifactId>mysql-connector-java</artifactId>
-			<version>8.0.24</version>
+			<version>8.0.28</version>
 		</dependency>
 	</dependencies>