Update R-CMD-check.yaml

Author: ejikeugba

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

@@ -16,9 +16,9 @@ jobs:
           - {os: windows-latest, r: 'release'}
           - {os: windows-latest, r: 'devel'}
           # MAC OS
-          - {os: macOS-latest, r: 'oldrel'}
-          - {os: macOS-latest, r: 'release'}
-          - {os: macOS-latest, r: 'devel'}
+          - {os: macos-13, r: 'oldrel'} 
+          - {os: macos-13, r: 'release'}
+          - {os: macos-13, r: 'devel'}
           # LINUX
           #- {os: ubuntu-18.04, r: 'oldrel', rspm: "https://packagemanager.rstudio.com/cran/__linux__/focal/latest"}
           #- {os: ubuntu-18.04, r: 'release', rspm: "https://packagemanager.rstudio.com/cran/__linux__/focal/latest"}