Updated chore due date to ISO 8601 format

Ensured that the 'due_date' variable is now formatted in strict ISO 8601
compliance by removing microseconds and appending 'Z' to indicate UTC.
This change aids in consistent date-time parsing across different
systems and services that expect a standardized timestamp without
fractional seconds.

scripts/chores.py

@@ -26,7 +26,7 @@ CHORES = (
 )
 
 
-due_date = (datetime.utcnow() + timedelta(days=EXPIRY_DAYS)).isoformat()
+due_date = (datetime.utcnow() + timedelta(days=EXPIRY_DAYS)).isoformat().split(".")[0] + "Z"
 
 payload = {
     "title": "Weekly Chores",