Bump mongoose from 5.4.5 to 5.13.15 in /06-login_node

Bumps [mongoose](https://github.com/Automattic/mongoose) from 5.4.5 to 5.13.15.
- [Release notes](https://github.com/Automattic/mongoose/releases)
- [Changelog](https://github.com/Automattic/mongoose/blob/master/CHANGELOG.md)
- [Commits](Automattic/mongoose@5.4.5...5.13.15)

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

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

Author: dependabot[bot]

06-login_node/package-lock.json

@@ -26,7 +26,7 @@
     "ejs": "^2.6.1",
     "express": "^4.16.4",
     "express-session": "^1.15.6",
-    "mongoose": "^5.4.5",
+    "mongoose": "^5.13.15",
     "morgan": "^1.9.1",
     "passport": "^0.4.0",
     "passport-local": "^1.0.0"