0.4.8

Bilal Elmoussaoui:

• gtk: Add NativeDialog::run_async
• Implement FusedIterator for custom iterators
• Add GTK 4.8 features

Ian Douglas Scott:

• gtk4: Use Key in accelerator_ function bindings
• gdk4-x11: Make assert_initialized_main_thread a no-op
• gdk4-x11: Make X11Display::set_program_class take &self

Sebastian Dröge:

• gtk4: Mark gtk::GestureClick::unpaired-release sequence parameter as nullable