Update app.py

app.py

@@ -9,7 +9,7 @@ API_KEY = st.secrets["API_KEY"]
 url = "https://api.hyperbolic.xyz/v1/chat/completions"
 headers = {
     "Content-Type": "application/json",
-    "Authorization": "Bearer {API_KEY}"
+    "Authorization": f"Bearer {API_KEY}"
 }
 
 # Chat history container