Update the content schema
Update the content schema

The content schemas were modified in PR: https://github.com/alphagov/govuk-content-schemas/pull/374

The content published by the calculators app has to conform to the updated
schema.
mikeee/z_archived-calculators,mikeee/z_archived-calculators,mikeee/z_archived-calculators,mikeee/z_archived-calculators