build(deps): bump mysql2 from 3.9.3 to 3.9.8 (#483)

Bumps [mysql2](https://github.com/sidorares/node-mysql2) from 3.9.3 to 3.9.8.
- [Release notes](https://github.com/sidorares/node-mysql2/releases)
- [Changelog](https://github.com/sidorares/node-mysql2/blob/master/Changelog.md)
- [Commits](https://github.com/sidorares/node-mysql2/compare/v3.9.3...v3.9.8)

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

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backend/package.json

@@ -52,7 +52,7 @@
     "lodash": "^4.17.21",
     "moment-timezone": "^0.5.21",
     "multer": "^1.4.5-lts.1",
-    "mysql2": "^3.9.3",
+    "mysql2": "^3.9.8",
     "parse-color": "^1.0.0",
     "passport": "^0.6.0",
     "passport-custom": "^1.0.5",