Update app.py

Fix key error: serialized_input

Traceback (most recent call last):
File "/home/user/app/app.py", line 35, in <module>
iface = gr.Interface(fn=find_layout, inputs=[gr.Image(type="pil")], outputs="text", examples=examples)
File "/home/user/.local/lib/python3.10/site-packages/gradio/interface.py", line 403, in __init__
with self:
File "/home/user/.local/lib/python3.10/site-packages/gradio/blocks.py", line 1200, in __exit__
self.config = self.get_config_file()
File "/home/user/.local/lib/python3.10/site-packages/gradio/blocks.py", line 1176, in get_config_file
"input": list(block.input_api_info()), # type: ignore
File "/home/user/.local/lib/python3.10/site-packages/gradio_client/serializing.py", line 41, in input_api_info
return (api_info["serialized_input"][0], api_info["serialized_input"][1])
KeyError: 'serialized_input'

app.py

@@ -1,4 +1,4 @@
-import gradio as gr
+import gradio==3.28.3 as gr
 import os
 import cv2
 import numpy as np