Not using Mongo, yet Keystone installs a Mongo binary

[thekevinbrown]

Bug report

Describe the bug

When using the latest Keystone packages, mongodb-memory-server is installed in node_modules, which then drags in a Mongo binary. This should not be the case as I'm using the Knex Adapter and Postgres.

To Reproduce

Steps to reproduce the behaviour:

1. Set up a postgres app
2. npm i

Expected behaviour

Mongo Binary not installed

Screenshots

> mongodb-memory-server@6.5.2 postinstall [project]/node_modules/mongodb-memory-server
> node ./postinstall.js

mongodb-memory-server: checking MongoDB binaries cache...
mongodb-memory-server: binary path is [project]/node_modules/.cache/mongodb-memory-server/mongodb-binaries/4.0.14/mongod

System information

• OS: macOS
• Browser (if applies) N/A

Additional context

I think this comes from test utils, when dependencies on Mongo or Knex should happen at the adapter level.