Bump mysql-connector-java from 8.0.20 to 8.0.28

Bumps [mysql-connector-java](https://github.com/mysql/mysql-connector-j) from 8.0.20 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@8.0.20...8.0.28)

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

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

pom.xml

@@ -62,7 +62,7 @@
         <h2.version>2.1.210</h2.version>
         <oracle.version>19.3.0.0</oracle.version>
         <jtds.version>1.3.0</jtds.version>
-        <mysql.connector.version>8.0.20</mysql.connector.version>
+        <mysql.connector.version>8.0.28</mysql.connector.version>
         <postgres.driver.version>42.4.1</postgres.driver.version>
         <spring.version>5.3.18</spring.version>
         <hibernate.version>5.4.28.Final</hibernate.version>