activate macos checks

Author: Toby Dylan Hocking

.github/workflows/R-CMD-check.yaml

@@ -26,7 +26,8 @@ jobs:
           # jobs (mainly test-coverage) to run on every commit in PRs so as to not slow down dev.
           # GHA does run these jobs concurrently but even so reducing the load seems like a good idea.
           - {os: windows-latest, r: 'devel'}
-          # - {os: macOS-latest, r: 'release'}    # test-coverage.yaml uses macOS
+          - {os: macos-14, r: 'release'}    
+          - {os: macos-15, r: 'release'}    
           # TODO(remotes>2.5.0): Use 24.04[noble?]
           - {os: ubuntu-22.04, r: 'release', rspm: "https://packagemanager.rstudio.com/cran/__linux__/jammy/latest"}
           # - {os: ubuntu-22.04,   r: 'devel', rspm: "https://packagemanager.rstudio.com/cran/__linux__/jammy/latest", http-user-agent: "R/4.1.0 (ubuntu-22.04) R (4.1.0 x86_64-pc-linux-gnu x86_64 linux-gnu) on GitHub Actions" }