Bump mysql-connector-java in /bundles/org.openhab.persistence.jdbc (#12981)

Bump mysql-connector-java in /bundles/org.openhab.persistence.jdbc (#12981)

Bumps [mysql-connector-java](https://github.com/mysql/mysql-connector-j) from 8.0.22 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/8.0.22...8.0.28)

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

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>