Remove code examples for Python 3.8 in `response_headers`

docs/en/docs/advanced/response-headers.md

@@ -6,7 +6,7 @@ You can declare a parameter of type `Response` in your *path operation function*
 
 And then you can set headers in that *temporal* response object.
 
-{* ../../docs_src/response_headers/tutorial002.py hl[1, 7:8] *}
+{* ../../docs_src/response_headers/tutorial002_py39.py hl[1, 7:8] *}
 
 And then you can return any object you need, as you normally would (a `dict`, a database model, etc).
 
@@ -22,7 +22,7 @@ You can also add headers when you return a `Response` directly.
 
 Create a response as described in [Return a Response Directly](response-directly.md){.internal-link target=_blank} and pass the headers as an additional parameter:
 
-{* ../../docs_src/response_headers/tutorial001.py hl[10:12] *}
+{* ../../docs_src/response_headers/tutorial001_py39.py hl[10:12] *}
 
 /// note | Technical Details
 

tests/test_tutorial/test_response_headers/test_tutorial001.py

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

tests/test_tutorial/test_response_headers/test_tutorial002.py

@@ -1,6 +1,6 @@
 from fastapi.testclient import TestClient
 
-from docs_src.response_headers.tutorial002 import app
+from docs_src.response_headers.tutorial002_py39 import app
 
 client = TestClient(app)