Remove invalid type (#422)

Author: joostlek

src/spotifyaio/models.py

@@ -404,7 +404,7 @@ def __pre_deserialize__(cls, d: dict[str, Any]) -> dict[str, Any]:
 class PlaylistTrack(DataClassORJSONMixin):
     """PlaylistTrack model."""
 
-    track: Annotated[Item, Discriminator(field="type", include_subtypes=True)] | None
+    track: Annotated[Item, Discriminator(field="type", include_subtypes=True)]
 
 
 @dataclass