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

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/blade/pom.xml

@@ -18,7 +18,7 @@
         <netty.version>4.1.76.Final</netty.version>
         <anima.version>0.3.1</anima.version>
         <hikaricp.version>4.0.3</hikaricp.version>
-        <mysql-conn.version>8.0.18</mysql-conn.version>
+        <mysql-conn.version>8.0.28</mysql-conn.version>
         <blade-jetbrick.version>0.2.1</blade-jetbrick.version>
     </properties>