fix: free libnotify notification

src/main.zig

@@ -110,6 +110,7 @@ pub fn main() !void {
                 };
 
                 const notif = c.notify_notification_new(title, text, null);
+                defer c.g_object_unref(notif);
                 c.notify_notification_set_urgency(notif, @intCast(c_uint, urgency));
                 _ = c.notify_notification_show(notif, null);
             },