fix constructs import in integ-tests fixture

Author: MrArnoldPalmer

packages/@aws-cdk/integ-tests/rosetta/default.ts-fixture

@@ -1,8 +1,8 @@
 import * as lambda from '@aws-cdk/aws-lambda';
 import { IntegTestCase } from '@aws-cdk/integ-tests';
+import { Construct } from 'constructs';
 import {
   App,
-  Construct,
   Stack,
   StackProps,
 } from '@aws-cdk/core';