Add godot 4.3 to minimal CI

- Remove noisy comment.

Author: Yarwin

godot-core/src/registry/class.rs

@@ -479,7 +479,6 @@ fn fill_class_info(item: PluginItem, c: &mut ClassRegistrationInfo) {
             c.godot_params.property_can_revert_func = user_property_can_revert_fn;
             c.godot_params.property_get_revert_func = user_property_get_revert_fn;
             c.user_virtual_fn = get_virtual_fn;
-            // Not present in GDExtension.
             #[cfg(since_api = "4.2")]
             {
                 c.godot_params.validate_property_func = validate_property_fn;