Modernize R CMD CHECK workflow: upgrade actions, expand OS/R matrix, remove AppVeyor#75

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DillonHammill merged 3 commits intomasterfrom

copilot/update-github-actions-to-v4

Mar 14, 2026

Commits on Mar 14, 2026

Initial plan
Copilot
committed
Update actions/cache from v2 to v4 in check-standard.yaml

Copilot
and
DillonHammill
committed
Modernize R CMD CHECK workflow: release+devel on all OS, upgrade actions, remove appveyor

Copilot
and
DillonHammill
committed