fix: lint

Author: Vinit Kumar

tests/test_dict2xml.py

@@ -498,4 +498,4 @@ def test_datetime_conversion_with_custom_attributes(self):
     def test_date_conversion_with_custom_attributes(self):
         data = {"key": datetime.date(2023, 2, 15)}
         result = dicttoxml.dicttoxml(data, attr_type=False, custom_root="custom")
-        assert b"<custom><key>2023-02-15</key></custom>" in result
+        assert b"<custom><key>2023-02-15</key></custom>" in result