Is it possible to update APCu to the latest version?

You are running an older version of APCu (5.1.15), newer version 5.1.17 is available at PECL :: Package :: APCu 5.1.17

What has changed?
5.1.17 - Fixed compatibility with PHP 7.4 and PHP 8.0.
5.1.16 - Fix build on OSX.

Since we i doubt any of us here will be using php 7.4 anytime soon, im sure litespeed will update it where there is a need to update, cyberpanel is using litespeed repo for php so its up to them to update.