In #278 we switched from using gems (jquery-rails etc.) to vendoring (by copying the .js assets from those gems).
So we are now responsible for updating jQuery (by downloading from the official source, likewise for jQuery UI and jQuery.countdown). It might be tricky for jQuery UI because it has lots of files; and note that it includes a copy of jQuery.
(Once we upgrade to Rails 7 we should probably switch to importmaps.)
In #278 we switched from using gems (jquery-rails etc.) to vendoring (by copying the .js assets from those gems).
So we are now responsible for updating jQuery (by downloading from the official source, likewise for jQuery UI and jQuery.countdown). It might be tricky for jQuery UI because it has lots of files; and note that it includes a copy of jQuery.
(Once we upgrade to Rails 7 we should probably switch to importmaps.)