Update jQuery

Hello

Thank you for your query.

Actually jQuery 1.12.4 - this is part of the joomla core.

You can use third-party extensions to integrate the version of jQuery you need, for example: https://simplifyyourweb.com/downloads/jquery-easy#downloads

But kindly note that jQuery 1.12.4 is used for a reason. And in order for your website to be as compatible as possible with outdated versions of browsers.