Bump mysql-connector-java in /frameworks/Java/minijax

Bumps [mysql-connector-java](https://github.com/mysql/mysql-connector-j) from 8.0.18 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/8.0.18...8.0.28)

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

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

frameworks/Java/minijax/pom.xml

@@ -14,7 +14,7 @@
         <eclipselink.version>2.7.4</eclipselink.version>
         <jpa.version>2.2.1</jpa.version>
         <minijax.version>0.3.14</minijax.version>
-        <mysql-connector.version>8.0.18</mysql-connector.version>
+        <mysql-connector.version>8.0.28</mysql-connector.version>
         <shade.version>3.1.0</shade.version>
     </properties>
     <dependencies>