fix: assert >= 14 on num days not given day (#4986)

The assert was probably meant to ensure the complete year has at least
14 days, and not that the given day is at least the 14th day of the year

Fixes: #4977

components/datetime/src/input.rs

@@ -389,7 +389,7 @@ impl ExtractedDateTimeInput {
                     "iso_weekday",
                 ))?;
         // We don't have any calendars with < 14 days per year, and it's unlikely we'll add one
-        debug_assert!(day_of_year_info.day_of_year >= icu_calendar::week::MIN_UNIT_DAYS);
+        debug_assert!(day_of_year_info.days_in_year >= icu_calendar::week::MIN_UNIT_DAYS);
         debug_assert!(day_of_year_info.days_in_prev_year >= icu_calendar::week::MIN_UNIT_DAYS);
         #[allow(clippy::unwrap_used)]
         let week_of = calculator