Bump mysql2 from 1.5.3 to 3.9.7 in /frameworks/JavaScript/koa (#8933)

Bumps [mysql2](https://github.com/sidorares/node-mysql2) from 1.5.3 to 3.9.7.
- [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/v1.5.3...v3.9.7)

---
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/koa/package.json

@@ -12,7 +12,7 @@
     "koa-hbs": "1.0.0",
     "koa-router": "7.4.0",
     "mongoose": "5.13.20",
-    "mysql2": "1.5.3",
+    "mysql2": "3.9.7",
     "pg": "8.5.1",
     "pg-hstore": "2.3.2",
     "sequelize": "6.29.0"