fix(module:date-picker): week number error when cross years (#7923)

Co-authored-by: 昀澈 <aoyuchen.ayc@alibaba-inc.com>

Author: Laffery

components/date-picker/date-picker.component.ts

@@ -743,7 +743,7 @@ export class NzDatePickerComponent implements OnInit, OnChanges, AfterViewInit,
     const inputFormats: { [key in NzDateMode]?: string } = {
       year: 'yyyy',
       month: 'yyyy-MM',
-      week: this.i18n.getDateLocale() ? 'RRRR-II' : 'yyyy-ww', // Format for week
+      week: 'YYYY-ww',
       date: this.nzShowTime ? 'yyyy-MM-dd HH:mm:ss' : 'yyyy-MM-dd'
     };