feat: Add GAP 4.14.0, remove older for a while (#28)

Author: limakzi

.github/workflows/main.yaml

@@ -31,11 +31,8 @@ jobs:
         image:
           - ubuntu-2204-lts
         gap-version:
+          - 4.14.0
           - 4.13.1
-          - 4.13.0
-          - 4.12.2
-          - 4.12.1
-          - 4.12.0
 
     steps:
       - name: 👨‍💻 git -- checkout