mypy: Enable new error explicit-override.

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

analytics/management/commands/populate_analytics_db.py

@@ -5,7 +5,7 @@ from typing import Any, Dict, List, Mapping, Type, Union
 from django.core.files.uploadedfile import UploadedFile
 from django.core.management.base import BaseCommand
 from django.utils.timezone import now as timezone_now
-from typing_extensions import TypeAlias
+from typing_extensions import TypeAlias, override
 
 from analytics.lib.counts import COUNT_STATS, CountStat, do_drop_all_analytics_tables
 from analytics.lib.fixtures import generate_time_series_data
@@ -68,6 +68,7 @@ class Command(BaseCommand):
             random_seed=self.random_seed,
         )
 
+    @override
     def handle(self, *args: Any, **options: Any) -> None:
         # TODO: This should arguably only delete the objects
         # associated with the "analytics" realm.