build(deps): bump mysql2 from 2.3.3 to 3.9.4

Bumps [mysql2](https://github.com/sidorares/node-mysql2) from 2.3.3 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@v2.3.3...v3.9.4)

---
updated-dependencies:
- dependency-name: mysql2
  dependency-type: direct:production
...

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

package.json

@@ -16,7 +16,7 @@
     "helmet": "^5.1.0",
     "jayson": "^3.6.6",
     "jsonwebtoken": "^9.0.0",
-    "mysql2": "^2.3.3",
+    "mysql2": "^3.9.4",
     "node-fetch": "^3.3.2",
     "reflect-metadata": "^0.1.10",
     "ts-node": "10.9.1",