Remove resolution of @inquirer/core

[pixelastic]

@inquirer/core@11.1.9 seems to have a bug with the PassThrough streams (or the
issue is on my side).

Both @inquirer/prompt and @inquirer/select have loose deps in
@inquirer/core and always load the latest.

@inquirer/11.1.1 doesn't have the issue, so I pinned it in package.json
resolution field.

I have no way to automatically detect this field is no longer needed, so I file
this issue.