Fix typehinting errors for attribute access

[piercefreeman]

Determine whether there's a way to modify our typehinting to avoid this error on attribute access, which is valid because of our metaclass but usually not allowed in contexts like dataclass or Pydantic BaseModels.

error[unresolved-attribute]: Attribute order can only be accessed on instances, not on the class object <class 'PostConvertedImage'> itself.
--> amplify/controllers/shared/posts_common.py:87:23
|
85 | ),
86 | )
87 | .order_by(models.PostConvertedImage.order)
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
88 | )
89 | converted_media = await db_session.exec(converted_media_query)
|
info: rule unresolved-attribute is enabled by default