[core] Update Flutter to Version 3.24.0 (#189)

Update Flutter to Version 3.24.0 and replace the deprecated `background`
and `onBackground` colors with `surface` and `onSurface`. Within this
migration we also adjusted the `onSecondary` color, so that the apps
look as before the update.

app/lib/widgets/column/create/create_column.dart

@@ -164,6 +164,8 @@ class _CreateColumnState extends State<CreateColumn> {
               padding: const EdgeInsets.all(Constants.spacingMiddle),
               child: ElevatedButton.icon(
                 style: ElevatedButton.styleFrom(
+                  backgroundColor: Constants.secondary,
+                  foregroundColor: Constants.onSecondary,
                   maximumSize: const Size.fromHeight(
                     Constants.elevatedButtonSize,
                   ),