Bump mongoose from 5.10.8 to 5.13.15

Bumps [mongoose](https://github.com/Automattic/mongoose) from 5.10.8 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@5.10.8...5.13.15)

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

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

Author: dependabot[bot]

package-lock.json

@@ -28,7 +28,7 @@
         "express": "^4.17.1",
         "express-fileupload": "^1.2.0",
         "jsonwebtoken": "^9.0.0",
-        "mongoose": "^5.10.7",
+        "mongoose": "^5.13.15",
         "mongoose-unique-validator": "^2.0.3",
         "underscore": "^1.11.0"
     },