sysutils/R-cran-processx: Update to 3.9.0

[jrm]

Summary

Release notes: https://github.com/r-lib/processx/releases/tag/v3.9.0

The previous version (3.8.6) failed to build against math/R 4.6.0.
Rf_findVar is a non-API entry point whose declaration is no longer
available in R 4.6.0's installed headers. The vendored copy of
cleancall in processx called Rf_findVar directly in both cleancall.c and
init.c, causing a compile error. 3.9.0 fixes this upstream by replacing
the calls with R_getVar, with a compatibility shim for R < 4.5.0.

[eduardo]

Hello Joseph,

There's an PR in progress for cran-processx: https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=295049
and one for cran-dplyr waiting on maintainer approval: https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=295051

Thanks

[jrm]

Closing since I missed an existing PR.