Bump mongoose from 5.4.7 to 5.4.8

Bumps [mongoose](https://github.com/Automattic/mongoose) from 5.4.7 to 5.4.8.
- [Release notes](https://github.com/Automattic/mongoose/releases)
- [Changelog](https://github.com/Automattic/mongoose/blob/master/History.md)
- [Commits](Automattic/mongoose@5.4.7...5.4.8)

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

Author: dependabot-support

package-lock.json

@@ -27,7 +27,7 @@
         "handlebars": "^4.0.12",
         "jsonwebtoken": "^8.1.0",
         "memory-cache": "^0.2.0",
-        "mongoose": "^5.4.7",
+        "mongoose": "^5.4.8",
         "multer": "^1.3.1",
         "passport": "^0.4.0",
         "passport-local": "^1.0.0",