build(deps): bump mysql-connector-java from 8.0.25 to 8.0.28

Bumps [mysql-connector-java](https://github.com/mysql/mysql-connector-j) from 8.0.25 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](https://github.com/mysql/mysql-connector-j/compare/8.0.25...8.0.28)

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

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

pom.xml

@@ -39,7 +39,7 @@
         <maven.compiler.source>${java.version}</maven.compiler.source>
         <maven.compiler.target>${java.version}</maven.compiler.target>
         <spring-boot.version>2.5.12</spring-boot.version>
-        <mysql.connector.java.version>8.0.25</mysql.connector.java.version>
+        <mysql.connector.java.version>8.0.28</mysql.connector.java.version>
         <elasticsearch.version>7.13.4</elasticsearch.version>
         <mybatis-plus.version>3.5.2</mybatis-plus.version>
         <druid.version>1.2.8</druid.version>