fix: mypy types

Author: drish

resend/http_client.py

@@ -1,5 +1,5 @@
 from abc import ABC, abstractmethod
-from typing import Mapping, Optional, Tuple, Union, List
+from typing import Mapping, Optional, Tuple, Union, List, Dict
 
 
 class HTTPClient(ABC):
@@ -9,6 +9,6 @@ def request(
         method: str,
         url: str,
         headers: Mapping[str, str],
-        json: Optional[Union[dict[str, object], List[object]]] = None,
+        json: Optional[Union[Dict[str, object], List[object]]] = None,
     ) -> Tuple[bytes, int, Mapping[str, str]]:
         pass

resend/http_client_requests.py

@@ -1,4 +1,4 @@
-from typing import Mapping, Optional, Tuple, Union, List
+from typing import Mapping, Optional, Tuple, Union, List, Dict
 
 import requests
 
@@ -14,7 +14,7 @@ def request(
         method: str,
         url: str,
         headers: Mapping[str, str],
-        json: Optional[Union[dict[str, object], List[object]]] = None,
+        json: Optional[Union[Dict[str, object], List[object]]] = None,
     ) -> Tuple[bytes, int, Mapping[str, str]]:
         try:
             resp = requests.request(