[R-pkg-devel] Update timing of machines on CRAN?

Hi,

I maintain the prqlr package that uses rustc for compiling, so I 
regularly check the version of Rust on CRAN.
And I have noticed that the Rust version of Fedora has been stagnant for 
the past few months and was wondering why, but upon investigation I 
realized that this is because Fedora on CRAN is currently Fedora 36 (out 
of support in May).
<https://cran.r-project.org/web/checks/check_flavors.html>

It was quite a surprise to me that out of support Fedora is being used, 
but what is the normal cycle for machines on CRAN to be updated? And do 
we have any way of knowing that schedule?

Best,
Tatsuya