fix(core): export `SystemTrayMenuItemHandle` to fix doc generation. (#6440)

core/tauri/src/lib.rs

@@ -219,7 +219,7 @@ pub use self::utils::TitleBarStyle;
 #[cfg(all(desktop, feature = "system-tray"))]
 #[cfg_attr(doc_cfg, doc(cfg(feature = "system-tray")))]
 pub use {
-  self::app::tray::{SystemTray, SystemTrayEvent, SystemTrayHandle},
+  self::app::tray::{SystemTray, SystemTrayEvent, SystemTrayHandle, SystemTrayMenuItemHandle},
   self::runtime::menu::{SystemTrayMenu, SystemTrayMenuItem, SystemTraySubmenu},
 };
 pub use {