Update the inputs object to default to new inputs style - perhaps just remove support for `attribute` style

[aaronlippold]

https://docs.chef.io/inspec/inputs/#input-options-reference

[aaronlippold]

Looking at this code a bit deeper it seems to use the inspec-core inspec/input.rb class so this may be 'current' but further thought on where we want to go with this is required.