Update app.py

app.py

@@ -39,7 +39,7 @@ def setup():
 
     # Update Node version
     print("Updating Node...")
-    version = 20
+    version = "20"
     subprocess.run(["nvm", "install", version], check=True)
     subprocess.run(["nvm", "use", version], check=True)
     print(f"Node.js updated to version: {version}")