Fix scheduled event payload and docstring type

discord/scheduled_event.py

@@ -88,7 +88,7 @@ class ScheduledEvent(Hashable):
         The ID of the entity this event is for if available.
     start_time: :class:`datetime.datetime`
         The time that the scheduled event will start in UTC.
-    end_time: :class:`datetime.datetime`
+    end_time: Optional[:class:`datetime.datetime`]
         The time that the scheduled event will end in UTC.
     privacy_level: :class:`PrivacyLevel`
         The privacy level of the scheduled event.

discord/types/scheduled_event.py

@@ -75,7 +75,7 @@ class EntityMetadata(TypedDict):
 class ExternalScheduledEvent(_BaseGuildScheduledEvent):
     channel_id: Literal[None]
     entity_metadata: EntityMetadata
-    scheduled_end_time: Optional[str]
+    scheduled_end_time: str
     entity_type: Literal[3]