Remove unused timezone import.

analytics/lib/counts.py

@@ -1,7 +1,6 @@
 from django.conf import settings
 from django.db import connection, models
 from django.db.models import F
-from django.utils import timezone
 
 from analytics.models import InstallationCount, RealmCount, \
     UserCount, StreamCount, BaseCount, FillState, Anomaly, installation_epoch, \

analytics/models.py

@@ -1,5 +1,4 @@
 from django.db import models
-from django.utils import timezone
 
 from zerver.models import Realm, UserProfile, Stream, Recipient
 from zerver.lib.str_utils import ModelReprMixin