Bump mysql-connector-java in /bundles/org.openhab.persistence.jdbc

Bumps [mysql-connector-java](https://github.com/mysql/mysql-connector-j) from 8.0.13 to 8.0.16.
- [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@8.0.13...8.0.16)

Signed-off-by: dependabot[bot] <support@github.com>

bundles/org.openhab.persistence.jdbc/pom.xml

@@ -29,7 +29,7 @@
     <h2.version>1.4.191</h2.version>
     <hsqldb.version>2.3.3</hsqldb.version>
     <mariadb.version>1.4.6</mariadb.version>
-    <mysql.version>8.0.13</mysql.version>
+    <mysql.version>8.0.16</mysql.version>
     <postgresql.version>9.4.1212</postgresql.version>
     <sqlite.version>3.16.1</sqlite.version>
   </properties>