Revert "First steps into pytz deprecation"

This reverts commit e4e7d50659.

src/pretix/base/migrations/0031_auto_20160816_0648_squashed_0048_auto_20161129_1330.py

@@ -2,8 +2,6 @@
 # Generated by Django 1.10.4 on 2017-02-03 14:21
 from __future__ import unicode_literals
 
-from zoneinfo import ZoneInfo
-
 import django.core.validators
 import django.db.migrations.operations.special
 import django.db.models.deletion
@@ -28,7 +26,7 @@ def forwards42(apps, schema_editor):
         for s in EventSetting.objects.filter(key='timezone').values('object_id', 'value')
         }
     for order in Order.objects.all():
-        tz = ZoneInfo(etz.get(order.event_id, 'UTC'))
+        tz = pytz.timezone(etz.get(order.event_id, 'UTC'))
         order.expires = order.expires.astimezone(tz).replace(hour=23, minute=59, second=59)
         order.save()
 

src/pretix/base/migrations/0042_order_expires.py

@@ -2,9 +2,9 @@
 # Generated by Django 1.10.2 on 2016-10-19 17:57
 from __future__ import unicode_literals
 
-from zoneinfo import ZoneInfo
-
+import pytz
 from django.db import migrations
+from django.utils import timezone
 
 
 def forwards(apps, schema_editor):
@@ -15,7 +15,7 @@ def forwards(apps, schema_editor):
         for s in EventSetting.objects.filter(key='timezone').values('object_id', 'value')
     }
     for order in Order.objects.all():
-        tz = ZoneInfo(etz.get(order.event_id, 'UTC'))
+        tz = pytz.timezone(etz.get(order.event_id, 'UTC'))
         order.expires = order.expires.astimezone(tz).replace(hour=23, minute=59, second=59)
         order.save()
 

src/pretix/base/migrations/0198_invoice_sent_to_customer.py

@@ -1,7 +1,8 @@
 # Generated by Django 3.2.4 on 2021-09-30 10:25
-from datetime import datetime, timezone
+from datetime import datetime
 
 from django.db import migrations, models
+from pytz import UTC
 
 
 class Migration(migrations.Migration):
@@ -14,7 +15,7 @@ class Migration(migrations.Migration):
         migrations.AddField(
             model_name='invoice',
             name='sent_to_customer',
-            field=models.DateTimeField(blank=True, null=True, default=datetime(1970, 1, 1, 0, 0, 0, 0, tzinfo=timezone.utc)),
+            field=models.DateTimeField(blank=True, null=True, default=UTC.localize(datetime(1970, 1, 1, 0, 0, 0, 0))),
             preserve_default=False,
         ),
     ]