Remove unnecessary f-string (openapi-generators#155)

Co-authored-by: deepsource-autofix[bot] <62050782+deepsource-autofix[bot]@users.noreply.github.com>

Author: deepsource-autofix[bot]

tests/test_openapi_parser/test_properties.py

@@ -278,7 +278,7 @@ def test__validate_default_enum_items(self, mocker):
         inner_enum_property._validate_default.return_value = "AnEnum.val1"
 
         p = ListProperty(name="a name", required=True, default=["val1"], inner_property=inner_enum_property)
-        assert p.default == f"field(default_factory=lambda: cast(List[AnEnum], [AnEnum.val1]))"
+        assert p.default == "field(default_factory=lambda: cast(List[AnEnum], [AnEnum.val1]))"
 
 
 class TestUnionProperty: