fix(deps): bump mongoose from 5.9.2 to 5.12.0

Bumps [mongoose](https://github.com/Automattic/mongoose) from 5.9.2 to 5.12.0.
- [Release notes](https://github.com/Automattic/mongoose/releases)
- [Changelog](https://github.com/Automattic/mongoose/blob/master/History.md)
- [Commits](Automattic/mongoose@5.9.2...5.12.0)

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

package.json

@@ -31,7 +31,7 @@
     "jsonwebtoken": "^8.5.1",
     "lodash": "^4.17.21",
     "mongodb": "^3.6.4",
-    "mongoose": "^5.6.10",
+    "mongoose": "^5.12.0",
     "mongoose-encryption": "^2.0.3",
     "mongoose-unique-validator": "^2.0.3",
     "multer": "^1.4.2",