Daptin vulnerable to SQL injection via unvalidated goqu.L() calls in aggregate API

Daptin is a GraphQL/JSON-API headless CMS. Prior to version 0.11.4, the /aggregate/:typename endpoint accepted column and group query parameters that were passed verbatim to goqu.L() — a raw SQL literal expression builder — without any validation. This bypassed all parameterization and allowed authenticated users with any valid session to inject arbitrary SQL expressions. This issue has been patched in version 0.11.4.