more targeted testing of R versions

Author: palday

.github/workflows/ci.yml

@@ -16,14 +16,11 @@ jobs:
       fail-fast: false
       matrix:
         version:
-          - 'min'
           - '1'
-          - 'nightly'
         R:
           - 'release'
+          - '4.5'
           - '4.4'
-          - '4.0'
-          - '3.4'
         os: 
           - windows-latest
           - windows-2025