chore: Django3 has removed python_2_unicode_compatible.

Execute the codemodes.

lms/djangoapps/instructor_task/subtasks.py

@@ -14,7 +14,7 @@ import psutil
 from celery.states import READY_STATES, RETRY, SUCCESS
 from django.core.cache import cache
 from django.db import DatabaseError, transaction
-from django.utils.encoding import python_2_unicode_compatible
+
 
 from common.djangoapps.util.db import outer_atomic
 
@@ -120,7 +120,6 @@ def _generate_items_for_subtask(
         TASK_LOG.info("Number of items generated by chunking %s not equal to original total %s", num_items_queued, total_num_items)  # lint-amnesty, pylint: disable=line-too-long
 
 
-@python_2_unicode_compatible
 class SubtaskStatus:
     """
     Create and return a dict for tracking the status of a subtask.