Docs deployment automation deprecation

The docs deployment on release failed, transiently - subsequent rerun worked fine. But several deprecation messages were noted. Node js 20 in some action used, plus and outdated/deprecated `punycode`-package. 

<img width="980" height="476" alt="Image" src="https://github.com/user-attachments/assets/aa3af7e1-660b-4fe4-b2cd-5a37ba1453fd" />
