Remove comment on needs_py39

Author: Natarajan Krishnaswami

tests/test_attribute_keyed_dict.py

@@ -49,7 +49,7 @@ class Parent(SQLModel, table=True):
         assert parent.children_by_color[Color.Blue].value == 2
 
 
-@needs_pydanticv2  # Pydantic V1 doesn't support `dict` with number of arguments < 2
+@needs_pydanticv2
 @needs_py39  # Generic `dict` requires Python 3.9+
 def test_dict_relationship_throws_on_wrong_number_of_annotation_args(clear_sqlmodel):
     class Color(str, Enum):