fix(datetime): time button is easier to access with screen readers (#26019)

core/src/components/datetime/datetime.tsx

@@ -1912,6 +1912,8 @@ export class Datetime implements ComponentInterface {
 
     return (
       <div
+        // Non-visible months should be hidden from screen readers
+        aria-hidden={!isWorkingMonth ? 'true' : null}
         class={{
           'calendar-month': true,
           // Prevents scroll snap swipe gestures for months outside of the min/max bounds