Bump mysql-connector-java from 6.0.5 to 8.0.16 (#42)

Bump mysql-connector-java from 6.0.5 to 8.0.16 (#42)

Bumps [mysql-connector-java](https://github.com/mysql/mysql-connector-j) from 6.0.5 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](https://github.com/mysql/mysql-connector-j/compare/6.0.5...8.0.16)

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