Fix test failure on PostgreSQL

src/tests/base/test_memberships.py

@@ -26,6 +26,7 @@ from zoneinfo import ZoneInfo
 import pytest
 from django.conf import settings
 from django.core.exceptions import ValidationError
+from django.db import transaction
 from django.utils.timezone import now
 from django_scopes import scope
 from freezegun import freeze_time
@@ -211,6 +212,7 @@ def test_validate_membership_required(event, customer, membership, requiring_tic
 
 
 @pytest.mark.django_db(transaction=True)
+@transaction.atomic
 def test_validate_membership_ensure_locking(event, customer, membership, requiring_ticket, membership_type, django_assert_num_queries):
     with django_assert_num_queries(4) as captured:
         validate_memberships_in_order(