fix lint error

fix wrong-import-order / third party import "import six" should be placed before "from onadata.libs.utils.common_tags import KNOWN_DATE_FORMATS"

onadata/apps/viewer/parsed_instance_tools.py

@@ -6,14 +6,13 @@
 import json
 from builtins import str as text
 from typing import Any, Tuple
+import six
 
 from django.utils.translation import gettext_lazy as _
 
 from onadata.libs.utils.common_tags import KNOWN_DATE_FORMATS
 from onadata.libs.exceptions import InavlidDateFormat
 
-import six
-
 
 KNOWN_DATES = ["_submission_time", "_last_edited", "_date_modified"]
 NONE_JSON_FIELDS = {