REGRESSION (iOS 15): Intl.DateTimeFormat returns 2 digit years when year is 'numeric' and month is '2-digit' and day is '2-digit'

[Matt Carroll]

This test case passes:

```
const dtf = new Intl.DateTimeFormat('en-AU', { timeZone: 'Australia/Melbourne', year: 'numeric' });
const date = new Date(2021, 9, 2);
const parts = dtf.formatToParts(date);
const year = parts.find(part => part.type === 'year')
shouldBe(year.value, "2021")
```


This test case will fail:

```
const dtf = new Intl.DateTimeFormat('en-AU', { timeZone: 'Australia/Melbourne', year: 'numeric', month: '2-digit', day: '2-digit' });
const date = new Date(2021, 9, 2);
const parts = dtf.formatToParts(date);
const year = parts.find(part => part.type === 'year')
shouldBe(year.value, "2021") // actual is "21"
```

[Yusuke Suzuki]

Thanks! This is dupe of bug 230827.

*** This bug has been marked as a duplicate of bug 230827 ***