Bump sctk-adwaita to 0.4.1

This should force the use of system libraries for Fontconfig
and freetype instead of building them with cmake if missing.

This also fixes compilation failures on nightly.

Fixes #2373.

src/platform_impl/macos/event_loop.rs

@@ -210,7 +210,7 @@ impl<T> EventLoop<T> {
             // A bit of juggling with the callback references to make sure
             // that `self.callback` is the only owner of the callback.
             let weak_cb: Weak<_> = Rc::downgrade(&callback);
-            mem::drop(callback);
+            drop(callback);
 
             AppState::set_callback(weak_cb, Rc::clone(&self.window_target));
             let _: () = msg_send![app, run];