build(deps-dev): bump mongodb-memory-server from 9.1.4 to 9.1.6 (#265)

Bumps [mongodb-memory-server](https://github.com/nodkz/mongodb-memory-server/tree/HEAD/packages/mongodb-memory-server) from 9.1.4 to 9.1.6.
- [Release notes](https://github.com/nodkz/mongodb-memory-server/releases)
- [Changelog](https://github.com/nodkz/mongodb-memory-server/blob/master/CHANGELOG.md)
- [Commits](https://github.com/nodkz/mongodb-memory-server/commits/v9.1.6/packages/mongodb-memory-server)

---
updated-dependencies:
- dependency-name: mongodb-memory-server
  dependency-type: direct:development
  update-type: version-update:semver-patch
...

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