deprecated code jquery

Since the last upgrade of Wordpress (5.5) I needed jQuery Migrate Helper to make the mobile-menu's in my Catch-Kathmandu theme (on http://ichthusculemborg.nl) working again. But then I got this warning: --- jQuery Migrate Helper — Warnings encountered This page generated the following warnings: https://ichthusculemborg.nl/wp-content/plugins/wp-analytify/assets/default/js/wp-analytify-dashboard.js: jQuery.fn.load() is deprecated Please make sure you are using the latest version of all of your plugins, and your theme. If you are, you may want to ask the developers of the code mentioned in the warnings for an update. --- So I guess you're one of the parties to ask for an update.