fix python 3.8 compat for edoxid calendar sync

apache/airflow:2.7.1 base image ships Python 3.8, which doesn't have
zoneinfo (3.9+) and can't evaluate `X | Y` / list[X] type hints at
runtime (3.10+). Add `from __future__ import annotations` everywhere
and swap zoneinfo -> pytz (already a dependency in this repo).

scripts/edoxid_calendar_sync.py

@@ -1,6 +1,9 @@
+from __future__ import annotations
+
 import logging
 from datetime import datetime, timedelta
-from zoneinfo import ZoneInfo
+
+import pytz
 
 from scripts.edoxid_calendar_config import (
     get_db_config,
@@ -22,7 +25,7 @@ from scripts.edoxid_calendar_state_store import StateStore
 
 logger = logging.getLogger(__name__)
 
-JAKARTA_TZ = ZoneInfo("Asia/Jakarta")
+JAKARTA_TZ = pytz.timezone("Asia/Jakarta")
 
 # Toleransi jendela waktu untuk cek reminder — harus >= interval polling DAG (5 menit)
 # supaya tidak ada window yang "kelewat" di antara 2 run.