ARN arn:aws:iam::aws:policy/arn:aws:iam::aws:policy/AmazonDynamoDBFullAccess is not valid. (Service: AmazonIdentityManagement; Status Code: 400; Error Code: InvalidInput

Around line 90 of the file vim app_sync_cdk/app_sync_cdk_stack.py may need to modified as below:
```js
items_table_role.add_managed_policy(
    ManagedPolicy.from_aws_managed_policy_name(
        'AmazonDynamoDBFullAccess'
    )
)
```

