ruff: Fix UP036 Version block is outdated for minimum Python version.

Signed-off-by: Anders Kaseorg <anders@zulip.com>

zerver/lib/email_notifications.py

@@ -12,6 +12,7 @@ from email.headerregistry import Address
 from typing import Any, Dict, List, Optional, Tuple, Union
 
 import lxml.html
+import zoneinfo
 from bs4 import BeautifulSoup
 from django.conf import settings
 from django.contrib.auth import get_backends
@@ -42,11 +43,6 @@ from zerver.models.messages import get_context_for_message
 from zerver.models.scheduled_jobs import NotificationTriggers
 from zerver.models.users import get_user_profile_by_id
 
-if sys.version_info < (3, 9):  # nocoverage
-    from backports import zoneinfo
-else:  # nocoverage
-    import zoneinfo
-
 logger = logging.getLogger(__name__)