chore(deps): bump mongoose from 6.2.5 to 6.4.6 in /examples/login

Bumps [mongoose](https://github.com/Automattic/mongoose) from 6.2.5 to 6.4.6.
- [Release notes](https://github.com/Automattic/mongoose/releases)
- [Changelog](https://github.com/Automattic/mongoose/blob/master/CHANGELOG.md)
- [Commits](Automattic/mongoose@6.2.5...6.4.6)

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

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

examples/login/package.json

@@ -12,7 +12,7 @@
     "cookie-session": "^2.0.0",
     "debug": "^4.3.3",
     "express": "^4.17.3",
-    "mongoose": "^6.2.5",
+    "mongoose": "^6.4.6",
     "morgan": "^1.10.0",
     "passport": "^0.5.2",
     "passport-local": "1.0.x",