⬆️ Bump mysql from 2.17.1 to 2.18.1 in /server (#380)

Bumps [mysql](https://github.com/mysqljs/mysql) from 2.17.1 to 2.18.1.
- [Changelog](https://github.com/mysqljs/mysql/blob/master/Changes.md)
- [Commits](mysqljs/mysql@v2.17.1...v2.18.1)

---
updated-dependencies:
- dependency-name: mysql
  dependency-type: indirect
...

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