ci: Bring back macOS and R devel

[krlmlr]

No description provided.

[aviator-app]

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This PR is not ready to merge (currently in state blocked): some required checks failed.

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[aviator-app]

This pull request failed to merge: some CI status(es) failed. Once the issues are resolved, remove the blocked label and re-queue the pull request. Note that the pull request will be automatically re-queued if it has the mergequeue label.

Failed CI(s): Check macOS-latest (release)

[krlmlr]

Need to install GLPK on macOS with Homebrew.