Bump mongoose from 5.6.4 to 5.7.5

Bumps [mongoose](https://github.com/Automattic/mongoose) from 5.6.4 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@5.6.4...5.7.5)

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

Author: dependabot[bot]

package-lock.json

@@ -20,7 +20,7 @@
     "body-parser": "^1.18.3",
     "concurrently": "^4.0.1",
     "express": "^4.16.3",
-    "mongoose": "^5.3.1",
+    "mongoose": "^5.7.5",
     "multer": "^1.4.0",
     "multer-s3": "^2.7.0",
     "path": "^0.12.7",