ajv fix on nodenext

Author: KKonstantinov

packages/core/src/validation/ajv-provider.ts

@@ -2,7 +2,7 @@
  * AJV-based JSON Schema validator provider
  */
 
-import Ajv from 'ajv';
+import { Ajv } from 'ajv';
 import _addFormats from 'ajv-formats';
 
 import type { JsonSchemaType, JsonSchemaValidator, jsonSchemaValidator, JsonSchemaValidatorResult } from './types.js';