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_google.py

@@ -1,6 +1,8 @@
-from datetime import datetime, timedelta
-from zoneinfo import ZoneInfo
+from __future__ import annotations
 
+from datetime import datetime, timedelta
+
+import pytz
 from google.auth.transport.requests import Request
 from google.oauth2.credentials import Credentials
 from googleapiclient.discovery import build
@@ -8,7 +10,7 @@ from googleapiclient.errors import HttpError
 
 from scripts.edoxid_calendar_config import GoogleConfig
 
-JAKARTA_TZ = ZoneInfo("Asia/Jakarta")
+JAKARTA_TZ = pytz.timezone("Asia/Jakarta")
 
 TYPE_LABELS = {
     1: "Seminar Proposal",
@@ -34,7 +36,9 @@ def get_schedule_datetime(submission: dict) -> datetime:
     schedule = submission["schedule"]
     if isinstance(schedule, str):
         schedule = datetime.fromisoformat(schedule)
-    return schedule.replace(tzinfo=JAKARTA_TZ)
+    if schedule.tzinfo is not None:
+        return schedule
+    return JAKARTA_TZ.localize(schedule)
 
 
 def get_type_label(submission: dict) -> str:
@@ -50,8 +54,8 @@ def format_indonesian_date(date: datetime) -> str:
 def build_description(submission: dict) -> str:
     schedule = get_schedule_datetime(submission)
     type_label = get_type_label(submission)
-    pembimbing = [v for v in submission["verificators"] if v["type"] == "Pembimbing"]
-    penguji = [v for v in submission["verificators"] if v["type"] == "Penguji"]
+    pembimbing = [v["name"] for v in submission["verificators"] if v["type"] == "Pembimbing"]
+    penguji = [v["name"] for v in submission["verificators"] if v["type"] == "Penguji"]
 
     lines = [
         f"UNDANGAN {type_label.upper()} SECARA LURING",
@@ -69,10 +73,10 @@ def build_description(submission: dict) -> str:
         "",
     ]
 
-    for i, v in enumerate(pembimbing, start=1):
-        lines.append(f"📕 Pembimbing {i} : {v['name']}")
-    for i, v in enumerate(penguji, start=1):
-        lines.append(f"📒 Penguji {i} : {v['name']}")
+    for i, name in enumerate(pembimbing, start=1):
+        lines.append(f"📕 Pembimbing {i} : {name}")
+    for i, name in enumerate(penguji, start=1):
+        lines.append(f"📒 Penguji {i} : {name}")
 
     lines += [
         "",