[R-pkg-team] Bug#1110481: #1110481: r-cran-gh: CVE-2025-54956

[Rebecca N. Palmer]

Control: tags -1 patch

Upstream note in 
https://cran.r-project.org/web/packages/gh/news/news.html that this is a 
breaking change because legitimate code could be using these values, but 
codesearch says we don't have anything that uses 
gh_next/gh_prev/gh_first/gh_last.

Hence, I propose to upload this new upstream version (if it works, which 
I haven't tested yet).