Panic when IslamicUmmAlQura month has 31 days

[anba]

use icu::calendar::Calendar;
use icu::calendar::islamic::IslamicUmmAlQura;
use icu::calendar::types::{Era, MonthCode};

use std::str::FromStr;

fn main() {
  let cal = IslamicUmmAlQura::new_always_calculating();
  let era = Era::from_str("ah").unwrap();
  let year = -6823;
  let month_code = MonthCode::from_str("M01").unwrap();
  let dt = cal.date_from_codes(era, year, month_code, 1);
}

panics with

umm-al-qura months must not be more than 30 days

[sffc]

This is fixed by #4904