Paginator Inspectors not used for swagger_auto_schema responses

[PaulWay]

I have a view with this definition:

    @swagger_auto_schema(
        paginator_inspectors=[OurCustomResponsePaginatorInspector],
        responses={200: AllRuleRatingsSerializer(many=True)},
    )
    @action(detail=False)
    def all_ratings(self, request, format=None):
        ...

Our custom response paginator inspector does not get called to convert the schema from the responses' serializer into a paginated schema.

[PaulWay]

I've created #499 as a fix for this problem.