refactor(api): remove member field compatibility (#37966)

Co-authored-by: WH-2099 <wh2099@pm.me>
Co-authored-by: autofix-ci[bot] <114827586+autofix-ci[bot]@users.noreply.github.com>
Co-authored-by: Asuka Minato <i@asukaminato.eu.org>

api/tests/unit_tests/fields/test_snippet_fields.py

@@ -1,9 +1,8 @@
 from datetime import UTC, datetime
 from types import SimpleNamespace
 
-from flask_restx import marshal
-
-from fields.snippet_fields import snippet_list_fields
+from fields.snippet_fields import SnippetListItemResponse
+from libs.helper import dump_response
 
 
 def test_snippet_list_fields_include_author_name() -> None:
@@ -24,6 +23,6 @@ def test_snippet_list_fields_include_author_name() -> None:
         updated_at=datetime.fromtimestamp(1704067201, tz=UTC),
     )
 
-    result = marshal(snippet, snippet_list_fields)
+    result = dump_response(SnippetListItemResponse, snippet)
 
     assert result["author_name"] == "Alice"