Suppress mypy error

Author: KanchiShimono

pydantic_settings/sources.py

@@ -881,7 +881,7 @@ class Cfg(BaseSettings):
                 type_has_key = self.next_field(type_, key, case_sensitive)
                 if type_has_key:
                     return type_has_key
-        elif is_model_class(annotation) or is_pydantic_dataclass(annotation):
+        elif is_model_class(annotation) or is_pydantic_dataclass(annotation):  # type: ignore[arg-type]
             fields = _get_model_fields(annotation)
             # `case_sensitive is None` is here to be compatible with the old behavior.
             # Has to be removed in V3.