chore(deps): bump mysql2 from 3.19.1 to 3.20.0 in /reference-apps/nodejs

Bumps [mysql2](https://github.com/sidorares/node-mysql2) from 3.19.1 to 3.20.0.
- [Release notes](https://github.com/sidorares/node-mysql2/releases)
- [Changelog](https://github.com/sidorares/node-mysql2/blob/master/Changelog.md)
- [Commits](sidorares/node-mysql2@v3.19.1...v3.20.0)

---
updated-dependencies:
- dependency-name: mysql2
  dependency-version: 3.20.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

reference-apps/nodejs/package-lock.json

@@ -30,7 +30,7 @@
     "express-rate-limit": "^8.2.2",
     "helmet": "^8.1.0",
     "mongodb": "^7.1.0",
-    "mysql2": "^3.16.3",
+    "mysql2": "^3.20.0",
     "node-vault": "^0.10.10",
     "pg": "^8.18.0",
     "prom-client": "^15.1.0",