Add ActiveAdmin 3.4 and 3.5 to CI test matrix

Author: Fivell

.github/workflows/ci.yml

@@ -12,7 +12,7 @@ jobs:
       matrix:
         ruby: ['3.2.0', '3.3.0', '3.4.0']
         rails: ['7.1.0', '7.2.0']
-        activeadmin: ['3.2.0', '3.3.0']
+        activeadmin: ['3.2.0', '3.3.0', '3.4.0', '3.5.0']
     env:
       RAILS: ${{ matrix.rails }}
       AA: ${{ matrix.activeadmin }}