fix: raise precise exception in rest_catalog list_namespaces

Author: alessandro-nori

pyiceberg/catalog/rest/__init__.py

@@ -816,7 +816,7 @@ def list_namespaces(self, namespace: Union[str, Identifier] = ()) -> List[Identi
         try:
             response.raise_for_status()
         except HTTPError as exc:
-            self._handle_non_200_response(exc, {})
+            self._handle_non_200_response(exc, {404: NoSuchNamespaceError})
 
         return ListNamespaceResponse.model_validate_json(response.text).namespaces