ordered is part of the Meta of a schema

[Jonathon Mills-Kelly]

ordered is part of Meta see https://marshmallow.readthedocs.io/en/stable/marshmallow.schema.html#marshmallow.schema.Schema.Meta, however it is currently pulled from the schema see https://github.com/marshmallow-code/apispec/blob/dev/src/apispec/ext/marshmallow/openapi.py#L180

Work around

import marshmallow

class Foo(marshmallow.Schema):
    class Meta:
        ordered = True

    ordered = True