I'm on Ionos too, but with a VPS, so I could enable PHP 5.6 on one site to test (it worked).
I've released the fixes to the
update tool for the Saratoga templates
Version 3.345 - 29-Nov-2021 (Base-*) update common.php V1.13, include-style-switcher.php V1.21 to add SameSite=Lax to cookie setting request;
(Base-USA) update nws-alertmap.js V1.01 to add SameSite=Lax to cookie setting request
For Base-*, *-Plugin, 29-Nov-2021
Thanks for bringing it to my attention, Jasiu .. there turned out to be two methods to add the SameSite=Lax to the setcookie() depending on PHP <7.3 or PHP 7.3+ so that's why I needed the test