put
https://example.com/test/api/web/holiday-calendars//bank-holidays/
api/web/holiday-calendars/{CalendarId}/bank-holidays/{HolidayId}
Updates an existing bank holiday within a calendar.
Bank holidays are date-only: any time component supplied on
SkySparc.Web.Backend.API.Models.WebAccess.BankHolidayModel.Date is truncated to midnight before
the holiday is stored.