fix literal import

Author: Ran Isenberg

aws_lambda_powertools/utilities/parser/models/apigw.py

@@ -1,9 +1,11 @@
 from datetime import datetime
-from typing import Any, Dict, List, Literal, Optional
+from typing import Any, Dict, List, Optional
 
 from pydantic import BaseModel, root_validator
 from pydantic.networks import IPvAnyNetwork
 
+from ..types import Literal
+
 
 class ApiGatewayUserCertValidity(BaseModel):
     notBefore: str