Bump mongodb and mongoose

Bumps [mongodb](https://github.com/mongodb/node-mongodb-native) to 4.12.1 and updates ancestor dependency [mongoose](https://github.com/Automattic/mongoose). These dependencies need to be updated together.


Updates `mongodb` from 2.2.27 to 4.12.1
- [Release notes](https://github.com/mongodb/node-mongodb-native/releases)
- [Changelog](https://github.com/mongodb/node-mongodb-native/blob/main/HISTORY.md)
- [Commits](mongodb/node-mongodb-native@V2.2.27...v4.12.1)

Updates `mongoose` from 4.11.1 to 6.8.3
- [Release notes](https://github.com/Automattic/mongoose/releases)
- [Changelog](https://github.com/Automattic/mongoose/blob/master/CHANGELOG.md)
- [Commits](Automattic/mongoose@4.11.1...6.8.3)

---
updated-dependencies:
- dependency-name: mongodb
  dependency-type: indirect
- dependency-name: mongoose
  dependency-type: direct:development
...

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Author: dependabot[bot]