Update engine.py

engine.py

@@ -188,7 +188,7 @@ def image_upscale(image, scale_by):
     image_url = prodia_client.upload(image)
     result = prodia_client.upscale_image({
         'imageUrl': image_url,
-        'resize': scale_by
+        'resize': int(scale_by)
     })
 
     job = prodia_client.wait(result)