build(deps-dev): bump mysql2 from 3.2.4 to 3.9.4

Bumps [mysql2](https://github.com/sidorares/node-mysql2) from 3.2.4 to 3.9.4.
- [Release notes](https://github.com/sidorares/node-mysql2/releases)
- [Changelog](https://github.com/sidorares/node-mysql2/blob/master/Changelog.md)
- [Commits](sidorares/node-mysql2@v3.2.4...v3.9.4)

---
updated-dependencies:
- dependency-name: mysql2
  dependency-type: indirect
...

Signed-off-by: dependabot[bot] <[email protected]>