give up on timezone crap and use a hard-coded number again

the python version in our container has no timezone data?

zulip_bots/zulip_bots/schedulebot.py

@@ -76,9 +76,7 @@ def hour_to_shift(hour, start_time):
 	"""Converts an hour number into a datetime, shift number (0-3), shift name, and hour-of-shift (1-6)"""
 	start_time = datetime.utcfromtimestamp(start_time)
 	current_time = (start_time + timedelta(hours=hour)).replace(minute=0, second=0, microsecond=0)
-	utc = ZoneInfo("UTC")
-	pst = ZoneInfo("America/Vancouver")
-	current_time_pst = current_time.replace(tzinfo=utc).astimezone(pst)
+	current_time_pst = current_time - timedelta(hours=7) # TODO change this back to 8
 	hour_pst = current_time_pst.hour
 	shift = hour_pst // 6
 	shift_name = ["zeta", "dawn-guard", "alpha-flight", "night-watch"][shift]