Fixed valid vercel.json JSON for Vercel deployment

vercel.json

@@ -1,4 +1,4 @@
-{
+{
   "version": 2,
   "builds": [
     { "src": "app.py", "use": "@vercel/python" }
@@ -11,4 +11,4 @@
     "STREAMLIT_SERVER_ENABLECORS": "false",
     "STREAMLIT_SERVER_PORT": "8000"
   }
-}
+}