Bump mongoose from 4.13.20 to 5.8.11

Bumps [mongoose](https://github.com/Automattic/mongoose) from 4.13.20 to 5.8.11.
- [Release notes](https://github.com/Automattic/mongoose/releases)
- [Changelog](https://github.com/Automattic/mongoose/blob/master/History.md)
- [Commits](Automattic/mongoose@4.13.20...5.8.11)

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

Author: dependabot[bot]

package.json

@@ -7,7 +7,7 @@
   "dependencies": {
     "ejs": "^2.7.1",
     "express": "^4.17.1",
-    "mongoose": "^4.13.19",
+    "mongoose": "^5.8.11",
     "multer": "^1.4.2",
     "nodemon": "^1.19.3"
   }