Bump mysql2 from 1.6.5 to 3.9.4 in /frameworks/JavaScript/nodejs (#8868)

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](https://github.com/sidorares/node-mysql2/compare/v1.6.5...v3.9.4)

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

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

frameworks/JavaScript/nodejs/package.json

@@ -8,7 +8,7 @@
     "mongodb": "3.7.3",
     "mongoose": "5.13.20",
     "mysql": "2.16.0",
-    "mysql2": "1.6.5",
+    "mysql2": "3.9.4",
     "parseurl": "1.3.2",
     "pg": "8.5.0",
     "pg-hstore": "2.3.2",