build(deps): bump mongoose from 5.5.11 to 5.5.12

Bumps [mongoose](https://github.com/Automattic/mongoose) from 5.5.11 to 5.5.12.
- [Release notes](https://github.com/Automattic/mongoose/releases)
- [Changelog](https://github.com/Automattic/mongoose/blob/master/History.md)
- [Commits](Automattic/mongoose@5.5.11...5.5.12)

Author: dependabot-preview[bot]

package-lock.json

@@ -68,7 +68,7 @@
     "lodash": "^4.17.11",
     "lusca": "~1.6.1",
     "method-override": "~3.0.0",
-    "mongoose": "~5.5.11",
+    "mongoose": "~5.5.12",
     "multer": "~1.4.1",
     "nodemailer": "~6.2.1",
     "nodemon": "^1.19.1",