fix: linting issues

Author: Vinit Kumar

tests/test_dict2xml.py

@@ -443,4 +443,4 @@ def test_dicttoxml_with_xml_namespaces(self):
     def test_datetime_conversion(self):
         data = {"key": datetime.datetime(2023, 2, 15, 12, 30, 45)}
         result = dicttoxml.dicttoxml(data, attr_type=False)
-        assert b"<key>2023-02-15T12:30:45</key>" in result
+        assert b"<key>2023-02-15T12:30:45</key>" in result