Remove code examples for Python 3.8 in `cors`

docs/en/docs/tutorial/cors.md

@@ -46,7 +46,7 @@ You can also specify whether your backend allows:
 * Specific HTTP methods (`POST`, `PUT`) or all of them with the wildcard `"*"`.
 * Specific HTTP headers or all of them with the wildcard `"*"`.
 
-{* ../../docs_src/cors/tutorial001.py hl[2,6:11,13:19] *}
+{* ../../docs_src/cors/tutorial001_py39.py hl[2,6:11,13:19] *}
 
 
 The default parameters used by the `CORSMiddleware` implementation are restrictive by default, so you'll need to explicitly enable particular origins, methods, or headers, in order for browsers to be permitted to use them in a Cross-Domain context.

tests/test_tutorial/test_cors/test_tutorial001.py

@@ -1,6 +1,6 @@
 from fastapi.testclient import TestClient
 
-from docs_src.cors.tutorial001 import app
+from docs_src.cors.tutorial001_py39 import app
 
 
 def test_cors():