Merge pull request #25 from gap-packages/mh/ci

Adjust CI to only test in GAP >= 4.12

Author: margollo

.github/workflows/CI.yml

@@ -28,9 +28,6 @@ jobs:
           - stable-4.14
           - stable-4.13
           - stable-4.12
-          - stable-4.11
-          - stable-4.10
-          - stable-4.9
 
     steps:
       - uses: actions/checkout@v5