jQuery UI releases have gone stagnant since 2017. Therefore, they contain deprecations of jQuery. The goal is just to correct those statements that need fixing, and change nothing else. These are the warnings:
JQMIGRATE: jQuery.expr[':'] is deprecated; use jQuery.expr.pseudos
JQMIGRATE: jQuery.expr.filters is deprecated; use jQuery.expr.pseudos
JQMIGRATE: jQuery.isArray is deprecated; use Array.isArray
JQMIGRATE: jQuery.isFunction() is deprecated
According to a discussion thread, this is already done in UI code, but is not included in a single release.
Use this code at your own risk. Though every effort has been made to write correct changes, I do not know how to test them fully. Also, lower versions of jQuery might have had other issues that were not fixed, like jQuery.unique is deprecated, use jQuery.uniqueSort, which are not warned about in the above configuration.