Bump mongodb from 3.6.11 to 4.2.1

Bumps [mongodb](https://github.com/mongodb/node-mongodb-native) from 3.6.11 to 4.2.1.
- [Release notes](https://github.com/mongodb/node-mongodb-native/releases)
- [Changelog](https://github.com/mongodb/node-mongodb-native/blob/main/docs/CHANGES_4.0.0.md)
- [Commits](mongodb/node-mongodb-native@v3.6.11...v4.2.1)

---
updated-dependencies:
- dependency-name: mongodb
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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Author: dependabot[bot]