Fix bookdown book rendering on CI

[cderv]

tlmgr: package repository https://ctan.math.illinois.edu/systems/texlive/tlnet (verified)
[1/1, ??:??/??:??] install: alegreya [23155k]
running mktexlsr ...
done running mktexlsr.
running updmap-sys ...
done running updmap-sys.
tlmgr: package log updated: /Users/runner/Library/TinyTeX/texmf-var/web2c/tlmgr.log
tlmgr: command log updated: /Users/runner/Library/TinyTeX/texmf-var/web2c/tlmgr-commands.log
tlmgr: package repository https://ctan.math.illinois.edu/systems/texlive/tlnet (verified)
[1/1, ??:??/??:??] install: sourcecodepro [3618k]
running mktexlsr ...
done running mktexlsr.
running updmap-sys ...
done running updmap-sys.
tlmgr: package log updated: /Users/runner/Library/TinyTeX/texmf-var/web2c/tlmgr.log
tlmgr: command log updated: /Users/runner/Library/TinyTeX/texmf-var/web2c/tlmgr-commands.log
! Argument of \Gin@ii has an extra }.
<inserted text> 
                \par 
l.3441 ...s to find the page you are looking for.}
                                                  ]{images/404}
I've run across a `}' that doesn't seem to match anything.
For example, `\def\a#1{...}' and `\a}' would produce
this error. If you simply proceed now, the `\par' that
I've just inserted will cause me to report a runaway
argument that might be the root of the problem. But if
your `}' was spurious, just type `2' and it will go away.

Error: Error: LaTeX failed to compile bookdown.tex. See https://yihui.org/tinytex/r/#debugging for debugging tips. See bookdown.log for more info.

Probably something in th template, or / and regarding the TeX Live update 🤔

https://github.com/rstudio/bookdown/actions/runs/13863052676/job/38795899756