Update models.py

Author: DerekMelchin

src/models.py

@@ -1,6 +1,6 @@
 # generated by datamodel-codegen:
 #   filename:  QuantConnect-Platform-2.0.0.yaml
-#   timestamp: 2025-06-25T21:34:11+00:00
+#   timestamp: 2025-06-25T23:02:44+00:00
 
 from __future__ import annotations
 from pydantic import RootModel, ConfigDict
@@ -260,7 +260,8 @@ class BybitUseTestnet(Enum):
 class Card(BaseModel):
     brand: Annotated[Optional[str], Field(description='Credit card brand.')] = None
     expiration: Annotated[
-        Optional[datetime], Field(description='The credit card expiration.')
+        Optional[str],
+        Field(description='The credit card expiration (mm/yy).', examples='12/27'),
     ] = None
     last4: Annotated[
         Optional[str], Field(description='The last 4 digits of the card.')