TypedDict isn't compatible with Dict, but is with Mapping

Using Mapping allows us to give MessageDict object and such directly,
without casting them as Dict.

Related Mypy issue: python/mypy#4976

src/chainlit/client/cloud.py

@@ -1,6 +1,6 @@
 import asyncio
 import uuid
-from typing import Any, Dict, Optional, cast
+from typing import Any, Dict, Mapping, Optional, cast
 
 import aiohttp
 from python_graphql_client import GraphqlClient
@@ -44,7 +44,7 @@ def check_for_errors(self, response: Dict[str, Any], raise_error: bool = False):
         return False
 
     async def mutation(
-        self, mutation: str, variables: Dict[str, Any] = {}
+        self, mutation: str, variables: Mapping[str, Any] = {}
     ) -> Dict[str, Any]:
         """
         Execute a GraphQL mutation.