Fix HF Space metadata: correct app_file to app.py, update Gradio to 4.44.0, fix emoji encoding

README.md

@@ -4,8 +4,8 @@ emoji: 🚀
 colorFrom: blue
 colorTo: purple
 sdk: gradio
-sdk_version: 3.40.0
-app_file: app_gradio.py
+sdk_version: 4.44.0
+app_file: app.py
 pinned: false
 license: mit
 ---