GHA: Skip macOS oldrel - external issue

Author: HenrikBengtsson

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

@@ -21,7 +21,7 @@ jobs:
           - {os: windows-latest, r: 'oldrel'   }
 #          - {os: macOS-latest,   r: 'devel'    }
           - {os: macOS-latest,   r: 'release'  }
-          - {os: macOS-latest,   r: 'oldrel'   }
+#          - {os: macOS-latest,   r: 'oldrel'   }
           - {os: ubuntu-latest,  r: 'devel'    }
           - {os: ubuntu-latest,  r: 'release'  }
           - {os: ubuntu-latest,  r: 'oldrel'   }