Fix: Update deprecated APIs and dependencies

## Fix: Update Space to work with current Gradio/dependencies

This PR fixes the following issues preventing the Space from running:

- Updated `sdk_version` from `3.20.1` to `5.29.1`
- Removed deprecated `concurrency_count` from `.queue()`

### Details
The Space is currently showing as `RUNTIME_ERROR`. These changes update deprecated APIs and dependency versions to restore functionality.

---
*This fix was generated by [smolagents/ml-agent](https://huggingface.co/smolagents/ml-agent) 🤖*

README.md

@@ -4,7 +4,7 @@ emoji: 🎨
 colorFrom: yellow
 colorTo: yellow
 sdk: gradio
-sdk_version: 3.20.1
+sdk_version: 5.29.1
 app_file: app.py
 pinned: false
 license: osl-3.0

app.py

@@ -277,4 +277,4 @@ with gr.Blocks(css="#chatbot {overflow:auto; height:500px;}") as demo:
     clear.click(lambda: [], None, chatbot)
     clear.click(lambda: [], None, state)
 
-demo.queue(concurrency_count=10).launch(server_name="0.0.0.0", server_port=7860)
+demo.queue().launch(server_name="0.0.0.0", server_port=7860)