fix date test

goofy-client/libs/tech-shared/src/lib/date.util.spec.ts

-import { registerLocaleData } from '@angular/common';
+import { formatDate, registerLocaleData } from '@angular/common';
 import localeDe from '@angular/common/locales/de';
-import { format } from 'date-fns';
-import { de } from 'date-fns/locale';
 import { formatForDatabase, formatFullDate, formatFullDateWithTimeAndDay, formatFullDateWithTimeWithoutSeconds, formatToPrettyDate, formatWithoutYear } from './date.util';
 
 registerLocaleData(localeDe);
@@ -46,8 +44,8 @@ describe('Date Util', () => {
 
 		it('should format date without year', () => {
 			const today: Date = new Date();
-			const day: string = format(today, 'dd');
-			const month: string = format(today, 'MMM', { locale: de });
+			const day: string = formatDate(today, 'dd', 'de');
+			const month: string = formatDate(today, 'MMM', 'de');
 
 			const result: string = formatToPrettyDate(today);