Bump content loader to 3.5.2 to fix niceToHaveRequirements validation
Bump content loader to 3.5.2 to fix niceToHaveRequirements validation

niceToHaveRequirements page was 500'ing due to a bug with the
content loader when validating questions that had not been answered.
This should fix that. For further context please see the related
PR for the content loader.

alphagov/digitalmarketplace-supplier-frontend,alphagov/digitalmarketplace-supplier-frontend,alphagov/digitalmarketplace-supplier-frontend,alphagov/digitalmarketplace-supplier-frontend