extras: upscaler blending should not be considered in cache key

                            upscaling_resize_w, upscaling_resize_h, upscaling_crop)

            cache_key = LruCache.Key(image_hash=hash(np.array(image.getdata()).tobytes()),

                                     info_hash=hash(info),

                                     args_hash=hash(upscale_args + (upscaler.blend_alpha,)))

                                     args_hash=hash(upscale_args))

            cached_entry = cached_images.get(cache_key)

            if cached_entry is None:

                res = upscale(image, *upscale_args)