Bump mongoose from 5.7.1 to 5.7.5 in /rest-api

Bumps [mongoose](https://github.com/Automattic/mongoose) from 5.7.1 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@5.7.1...5.7.5)

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

Author: dependabot[bot]

rest-api/package-lock.json

@@ -31,7 +31,7 @@
     "class-transformer": "^0.2.3",
     "class-validator": "^0.10.1",
     "jsonwebtoken": "^8.5.1",
-    "mongoose": "^5.7.1",
+    "mongoose": "^5.7.5",
     "npm-run-all": "^4.1.5",
     "password-hash-and-salt": "^0.1.4",
     "reflect-metadata": "0.1.13",