Ran pyupgrade on lms/djangoapps (#26519)

lms/djangoapps/bulk_email/admin.py

lms/djangoapps/bulk_email/api.py

lms/djangoapps/bulk_email/apps.py

lms/djangoapps/bulk_email/forms.py

lms/djangoapps/bulk_email/migrations/0001_initial.py

...email/migrations/0002_data__load_course_email_template.py

...s/bulk_email/migrations/0003_config_model_feature_flag.py

...jangoapps/bulk_email/migrations/0004_add_email_targets.py

...djangoapps/bulk_email/migrations/0005_move_target_data.py

...ngoapps/bulk_email/migrations/0006_course_mode_targets.py

lms/djangoapps/bulk_email/models.py

lms/djangoapps/bulk_email/signals.py

lms/djangoapps/bulk_email/tasks.py

lms/djangoapps/bulk_email/tests/test_course_optout.py

lms/djangoapps/bulk_email/tests/test_email.py

lms/djangoapps/bulk_email/tests/test_err_handling.py

lms/djangoapps/bulk_email/tests/test_forms.py

lms/djangoapps/bulk_email/tests/test_models.py

lms/djangoapps/bulk_email/tests/test_signals.py

lms/djangoapps/bulk_email/tests/test_tasks.py