fix(deps): update mantine monorepo to v8 (major) (#3022)

Co-authored-by: homarr-renovate[bot] <158783068+homarr-renovate[bot]@users.noreply.github.com>
Co-authored-by: Meier Lukas <meierschlumpf@gmail.com>

packages/widgets/src/calendar/component.tsx

@@ -72,8 +72,8 @@ const CalendarBase = ({ isEditMode, events, month, setMonth, options }: Calendar
   return (
     <Calendar
       defaultDate={new Date()}
-      onPreviousMonth={setMonth}
-      onNextMonth={setMonth}
+      onPreviousMonth={(month) => setMonth(new Date(month))}
+      onNextMonth={(month) => setMonth(new Date(month))}
       highlightToday
       locale={locale}
       hideWeekdays={false}
@@ -126,7 +126,7 @@ const CalendarBase = ({ isEditMode, events, month, setMonth, options }: Calendar
           .filter((event): event is CalendarEvent => Boolean(event.date));
         return (
           <CalendarDay
-            date={tileDate}
+            date={new Date(tileDate)}
             events={eventsForDate}
             disabled={isEditMode || eventsForDate.length === 0}
             rootWidth={width}