Man
Thanks, that's clear to me.
What is not clear to me is what to do now since I have only installed the Quickstart (of Purity IV, for example) and at the latest updated Joomla to version 4.29.
In other words, I haven't made any updates to code of Jommla, templates or CSS and, so, now I have to consider it as a simple "Alert" or do I have to do something instead?