Update CI

Author: minad

.github/workflows/test.yml

@@ -8,14 +8,14 @@ jobs:
       fail-fast: false
       matrix:
         emacs_version:
-          - '24.4'
-          - '24.5'
           - '25.1'
           - '25.2'
           - '25.3'
-          - '26.1'
-          - '26.2'
           - '26.3'
+          - '27.1'
+          - '27.2'
+          - '28.1'
+          - '28.2'
           - 'snapshot'
         include:
           - emacs_version: 'snapshot'