If a user runs yarn rw upgrade ... from a directory other than project root, there are cases where the root package.json is not handled correctly by yarn ('cause yarn is a mess when it comes to this command).

We need to ensure Execa has cwd set whenever it is called:
https://github.com/redwoodjs/redwood/blob/main/packages/cli/src/commands/upgrade.js