fix: upgrade mongoose from 6.9.1 to 6.13.8

Snyk has created this PR to upgrade mongoose from 6.9.1 to 6.13.8.

See this package in npm:
mongoose

See this project in Snyk:
https://app.snyk.io/org/krishguptadev/project/4b6a3be2-3c33-41ee-a670-8c88a094faeb?utm_source=github&utm_medium=referral&page=upgrade-pr

Author: snyk-bot