MOTOR-1420 Use generic return type for to_list() (#318)

Author: ShaneHarvey

motor/core.pyi

@@ -709,7 +709,7 @@ class AgnosticBaseCursor(AgnosticBase, Generic[_DocumentType]):
     def next_object(self) -> Any: ...
     def each(self, callback: Callable) -> None: ...
     def _each_got_more(self, callback: Callable, future: Any) -> None: ...
-    def to_list(self, length: Optional[int] = ...) -> Future[list[Any]]: ...
+    def to_list(self, length: Optional[int] = ...) -> Future[list[_DocumentType]]: ...
     def _to_list(
         self, length: Union[int, None], the_list: list, future: Any, get_more_result: Any
     ) -> None: ...