Merge pull request #10459 from SirReiva/fix-fastify-response

fix(core): return response required for fastify v4

Author: kamilmysliwiec

packages/core/router/router-execution-context.ts

@@ -454,6 +454,7 @@ export class RouterExecutionContext {
       result = await this.responseController.transformToResult(result);
       !isResponseHandled &&
         (await this.responseController.apply(result, res, httpStatusCode));
+      return res;
     };
   }