upgrade gradio to current version

upgrade gradio to current version to address security vuln issues in the outdated sdk

README.md

@@ -4,7 +4,7 @@ emoji: 🦀
 colorFrom: red
 colorTo: blue
 sdk: gradio
-sdk_version: 3.0.17
+sdk_version: 4.36.1
 app_file: app.py
 pinned: false
 license: bsd-3-clause
@@ -44,4 +44,4 @@ HF dataset IDs (like "common_voice" or "oscar-corpus/OSCAR-2109") used in the Sp
 Will be parsed automatically from your code if not specified here.
 
 `pinned`: _boolean_
-Whether the Space stays on top of your list.
+Whether the Space stays on top of your list.