Bump mysql from 2.8.0 to 2.18.1
Bump mysql from 2.8.0 to 2.18.1

Bumps [mysql](https://github.com/mysqljs/mysql) from 2.8.0 to 2.18.1.
- [Release notes](https://github.com/mysqljs/mysql/releases)
- [Changelog](https://github.com/mysqljs/mysql/blob/master/Changes.md)
- [Commits](https://github.com/mysqljs/mysql/compare/v2.8.0...v2.18.1)

Signed-off-by: dependabot[bot] <5bdcd3c0d4d24ae3e71b3b452a024c6324c7e4bb@github.com>
blueskyfish/temperature-sensor-reader