Ensure Gemfile.lock contains correct version of scss_lint
Ensure Gemfile.lock contains correct version of scss_lint

The Gemfile.lock uses a newer version of scss_lint that we want to
use right now.

nhsalpha/betahealth,nhsuk/betahealth,nhsalpha/betahealth,nhsuk/betahealth,nhsuk/betahealth,nhsalpha/betahealth