Remove code examples for Python 3.8 in `openapi_webhooks`

docs/en/docs/advanced/openapi-webhooks.md

@@ -32,7 +32,7 @@ Webhooks are available in OpenAPI 3.1.0 and above, supported by FastAPI `0.99.0`
 
 When you create a **FastAPI** application, there is a `webhooks` attribute that you can use to define *webhooks*, the same way you would define *path operations*, for example with `@app.webhooks.post()`.
 
-{* ../../docs_src/openapi_webhooks/tutorial001.py hl[9:13,36:53] *}
+{* ../../docs_src/openapi_webhooks/tutorial001_py39.py hl[9:13,36:53] *}
 
 The webhooks that you define will end up in the **OpenAPI** schema and the automatic **docs UI**.
 

tests/test_tutorial/test_openapi_webhooks/test_tutorial001.py

@@ -1,6 +1,6 @@
 from fastapi.testclient import TestClient
 
-from docs_src.openapi_webhooks.tutorial001 import app
+from docs_src.openapi_webhooks.tutorial001_py39 import app
 
 client = TestClient(app)