Remove versions not supported by latest flycheck

Author: xendk

.github/workflows/test.yml

@@ -14,10 +14,7 @@ jobs:
     strategy:
       matrix:
         os: [ubuntu-latest]
-        emacs_version: ['24.4', '24.5',
-                        '25.1', '25.2', '25.3',
-                        '26.1', '26.2', '26.3',
-                        '27.1', '27.2',
+        emacs_version: ['27.1', '27.2',
                         '28.1', '28.2',
                         '29.1', '29.2', '29.3', '29.4',
                         '30.1',