adapt to latest iced (Widget.size())

Widget combined height() and width() into a single size()
function

Signed-off-by: Fabrizio Iannetti <fabrizio.iannetti@gmail.com>

src/ui/calendar.rs

@@ -591,12 +591,8 @@ impl<Message, Renderer> Widget<Message, Renderer> for CalendarView<'_>
 where
     Renderer: text::Renderer,
 {
-    fn width(&self) -> Length {
-        Length::Shrink
-    }
-
-    fn height(&self) -> Length {
-        Length::Shrink
+    fn size(&self) -> Size<Length> {
+        Size { width: Length::Fill, height: Length::Fill }
     }
 
     fn layout(&self, _tree: &mut Tree, _renderer: &Renderer, limits: &layout::Limits) -> layout::Node {