Bump mongoose from 5.6.11 to 5.7.5 in /2-13_authentication

Bumps [mongoose](https://github.com/Automattic/mongoose) from 5.6.11 to 5.7.5.
- [Release notes](https://github.com/Automattic/mongoose/releases)
- [Changelog](https://github.com/Automattic/mongoose/blob/master/History.md)
- [Commits](Automattic/mongoose@5.6.11...5.7.5)

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

Author: dependabot[bot]

2-13_authentication/package-lock.json

@@ -12,6 +12,6 @@
     "body-parser": "^1.19.0",
     "ejs": "^2.6.2",
     "express": "^4.17.1",
-    "mongoose": "^5.6.11"
+    "mongoose": "^5.7.5"
   }
 }