only test latest minor version

Author: jcs090218

.github/workflows/test.yml

@@ -20,11 +20,8 @@ jobs:
       matrix:
         os: [ubuntu-latest, macos-latest, windows-latest]
         emacs-version:
-          - "26.1"
           - "26.3"
-          - "27.1"
           - "27.2"
-          - "28.1"
           - "28.2"
           - "29.1"
           - snapshot