This commit updates the week-numbering year format from `r` -> `Y` based on the description in http://www.unicode.org/reports/tr35/tr35-dates.html#dfst-year. Note: this is not a breaking change, since the week-numbering year format was introduced in v11.0.0-next.3 (https://github.com/angular/angular/commit/984ed39195d8291f0da0c2747a45761144e6daa2) and the major version that contains that change was not released yet. PR Close #39495