Bump mysql-connector-java from 8.0.16 to 8.0.28

Bumps [mysql-connector-java](https://github.com/mysql/mysql-connector-j) from 8.0.16 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@8.0.16...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]

pom.xml

@@ -54,7 +54,7 @@
         <tomcat.servlet.version>6.0.37</tomcat.servlet.version>
         <druid.version>1.1.10</druid.version>
         <mybatis-spring.version>1.3.1</mybatis-spring.version>
-        <mysql.version>8.0.16</mysql.version>
+        <mysql.version>8.0.28</mysql.version>
         <commons-pool2.version>2.2</commons-pool2.version>
         <commons-collections.version>3.2.1</commons-collections.version>
         <commons-fileupload.version>1.3.3</commons-fileupload.version>