build(deps): bump mysql2 from 3.6.0 to 3.9.1

Bumps [mysql2](https://github.com/sidorares/node-mysql2) from 3.6.0 to 3.9.1.
- [Release notes](https://github.com/sidorares/node-mysql2/releases)
- [Changelog](https://github.com/sidorares/node-mysql2/blob/master/Changelog.md)
- [Commits](sidorares/node-mysql2@v3.6.0...v3.9.1)

---
updated-dependencies:
- dependency-name: mysql2
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

package.json

@@ -18,7 +18,7 @@
     "express": "^4.18.2",
     "helmet": "^7.0.0",
     "jwt-decode": "^3.1.2",
-    "mysql2": "^3.6.0",
+    "mysql2": "^3.9.1",
     "node-fetch": "^2.7.0",
     "sequelize": "^6.35.1"
   }