Bump mongoose from 6.4.4 to 6.4.6

Bumps [mongoose](https://github.com/Automattic/mongoose) from 6.4.4 to 6.4.6.
- [Release notes](https://github.com/Automattic/mongoose/releases)
- [Changelog](https://github.com/Automattic/mongoose/blob/master/CHANGELOG.md)
- [Commits](Automattic/mongoose@6.4.4...6.4.6)

---
updated-dependencies:
- dependency-name: mongoose
  dependency-type: direct:production
...

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

Author: dependabot[bot]

package-lock.json

@@ -21,7 +21,7 @@
     "debug": "^4.1.1",
     "dotenv": "^6.2.0",
     "express": "^4.16.4",
-    "mongoose": "^6.4.4",
+    "mongoose": "^6.4.6",
     "morgan": "^1.9.1",
     "passportbundle": "latest",
     "path": "^0.12.7",