fix CI error

Author: chang-ph

ninja/signature/details.py

@@ -7,7 +7,7 @@
 from django.http import HttpResponse
 from pydantic.fields import FieldInfo
 from pydantic_core import PydanticUndefined
-from typing_extensions import Annotated, Unpack, get_args, get_origin
+from typing_extensions import Annotated, get_args, get_origin
 
 from ninja import UploadedFile
 from ninja.compatibility.util import UNION_TYPES
@@ -352,9 +352,6 @@ def detect_collection_fields(
         for path in (p for p in flatten_map.values() if len(p) > 1):
             annotation_or_field: Any = args_d[path[0]].annotation
             for attr in path[1:]:
-                if hasattr(annotation_or_field, "annotation"):
-                    annotation_or_field = annotation_or_field.annotation
-
                 if get_origin(annotation_or_field) is Annotated:
                     annotation_or_field = get_args(annotation_or_field)[0]