refactor: pytz -> ZoneInfo

Signed-off-by: Akhil Narang <me@akhilnarang.dev>

frappe/deprecation_dumpster.py

@@ -814,15 +814,19 @@ def get_tests_CompatFrappeTestCase():
 
 		@contextmanager
 		def freeze_time(self, time_to_freeze, is_utc=False, *args, **kwargs):
-			import pytz
+			from zoneinfo import ZoneInfo
+
 			from freezegun import freeze_time
 
 			from frappe.utils.data import convert_utc_to_timezone, get_datetime, get_system_timezone
 
 			if not is_utc:
 				# Freeze time expects UTC or tzaware objects. We have neither, so convert to UTC.
-				timezone = pytz.timezone(get_system_timezone())
-				time_to_freeze = timezone.localize(get_datetime(time_to_freeze)).astimezone(pytz.utc)
+				time_to_freeze = (
+					get_datetime(time_to_freeze)
+					.replace(tzinfo=ZoneInfo(get_system_timezone()))
+					.astimezone(ZoneInfo("UTC"))
+				)
 
 			with freeze_time(time_to_freeze, *args, **kwargs):
 				yield

frappe/tests/test_utils.py

@@ -5,14 +5,13 @@ import io
 import json
 import os
 import sys
-from datetime import date, datetime, time, timedelta
+from datetime import date, datetime, time, timedelta, timezone
 from decimal import ROUND_HALF_UP, Decimal, localcontext
 from enum import Enum
 from io import StringIO
 from mimetypes import guess_type
 from unittest.mock import patch
 
-import pytz
 from hypothesis import given
 from hypothesis import strategies as st
 from PIL import Image
@@ -736,9 +735,9 @@ class TestResponse(IntegrationTestCase):
 					minute=23,
 					second=23,
 					microsecond=23,
-					tzinfo=pytz.utc,
+					tzinfo=timezone.utc,
 				),
-				time(hour=23, minute=23, second=23, microsecond=23, tzinfo=pytz.utc),
+				time(hour=23, minute=23, second=23, microsecond=23, tzinfo=timezone.utc),
 				timedelta(days=10, hours=12, minutes=120, seconds=10),
 			],
 			"float": [