Bump mysql2 from 2.1.0 to 3.9.8 in /frameworks/TypeScript/nest

Bumps [mysql2](https://github.com/sidorares/node-mysql2) from 2.1.0 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/v2.1.0...v3.9.8)

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

Signed-off-by: dependabot[bot] <[email protected]>

frameworks/TypeScript/nest/package.json

@@ -26,7 +26,7 @@
     "handlebars": "4.7.3",
     "hbs": "4.1.0",
     "mongodb": "3.5.4",
-    "mysql2": "2.1.0",
+    "mysql2": "3.9.8",
     "pg": "8.5.1",
     "point-of-view": "3.7.2",
     "reflect-metadata": "0.1.13",