Minor typing fix following urllib3 update.

Author: lemon24

src/reader/_parser/http.py

@@ -92,7 +92,7 @@ def __call__(
 
                 error._message = "while reading feed"
                 yield RetrievedFeed(
-                    response.raw,
+                    cast(IO[bytes], response.raw),
                     mime_type,
                     # https://github.com/python/mypy/issues/4976
                     cast(dict[str, Any] | None, response_caching_info),