Fix CI failure: pin xfun 0.39 only for R 4.2

[AritraDey-Dev]

Description

Fix ci failure for R 4.2
https://github.com/PecanProject/pecan/actions/runs/21185564344/job/60939202625
https://github.com/PecanProject/pecan/actions/runs/21185564344/job/60939202582

Motivation and Context

Review Time Estimate

• Immediately
• Within one week
• When possible

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• My change requires a change to the documentation.
• My name is in the list of CITATION.cff
• I agree that PEcAn Project may distribute my contribution under any or all of
  • the same license as the existing code,
  • and/or the BSD 3-clause license.
• I have updated the CHANGELOG.md.
• I have updated the documentation accordingly.
• I have read the CONTRIBUTING document.
• I have added tests to cover my changes.
• All new and existing tests passed.

[infotroph]

Thanks for working on this. Let's dig a little further before merging -- my bias is that adding more complexity to the Makefile should be a ~last resort, and this is tripping my "feels like the real problem might be elsewhere" spidey sense.

Specifically:

• Both those runs installed roxygen2 7.3.2 as a binary in the last step of the "install new dependencies" step, so I'm not sure why the Make roxygen step is firing at all
• Then once it decides to reinstall Roxygen, I'm not sure how it's picking up a different xfun: The R4.2 image installs packages from a static CRAN snapshot, so I don't know what would have changed. I don't see xfun listed in the updates earlier in the log.

[AritraDey-Dev]

Both those runs installed roxygen2 7.3.2 as a binary in the last step of the "install new dependencies" step, so I'm not sure why the Make roxygen step is firing at all

since xfun isn't in pecan_package_dependencies.csv, so it's not pinned,so when docker/depends/pecan.depends.R installs roxygen2 7.3.2 with dependencies = TRUE, it pulls in xfun as a transitive dependency, roxygen2 7.3.2 allows xfun >= 0.30, so newer versions (>= 0.40) get installed, which don't have xfun::attr

[AritraDey-Dev]

i believe most proper solution in this case will be to install the xfun specifc version in docker/depends/pecan.depends.R