Bump mysql-connector-java from 8.0.21 to 8.0.28

Bumps [mysql-connector-java](https://github.com/mysql/mysql-connector-j) from 8.0.21 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@8.0.21...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

@@ -23,7 +23,7 @@
         <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
         <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
         <java.version>1.8</java.version>
-        <mysql-connector-java.version>8.0.21</mysql-connector-java.version>
+        <mysql-connector-java.version>8.0.28</mysql-connector-java.version>
         <roses.kernel.version>7.2.4</roses.kernel.version>
         <docker.img.version>latest</docker.img.version>
     </properties>