Update app.py

app.py

@@ -42,7 +42,7 @@ class LoadCsvTool(Tool):
 class WebhookPostTool(Tool):
     name = "webhook_post"
     description = "Send a JSON payload to a webhook URL and return the response as text."
-    input = {
+    inputs = {
         "webhook_url": {
             "type": "string",
             "description": "The url to send the payload to"