And this is a great example of planned obsolescence because Apple does not allow any other browser with its own rendering engine on ios - all browsers on ios are forced to use ios provided browser engine, and thus when they stop updating it, all browsers, even the non-Apple when become "outdated" to. All apps that also use WebViews also become "outdated". (Note that Safari is "bundled" as part of ios and thus stops receiving updates when ios updates stops).
Strangely enough they updated the kernel to one in 2021.