Bump mysql2 from 1.6.5 to 3.9.4 in /test/frameworks/JavaScript/nodejs

Bumps [mysql2](https://github.com/sidorares/node-mysql2) from 1.6.5 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@v1.6.5...v3.9.4)

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

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Author: dependabot[bot]

test/frameworks/JavaScript/nodejs/package.json

@@ -8,7 +8,7 @@
   "mongodb": "2.2.33",
     "mongoose": "5.7.5",
     "mysql": "2.16.0",
-    "mysql2": "1.6.5",
+    "mysql2": "3.9.4",
     "parseurl": "1.3.2",
     "pg": "6.1.6",
     "pg-hstore": "2.3.2",