CI: drop EOL Ruby 3.2 / Rails 7.1, cover Ruby 4.0 and Rails 8.1#221

Fivell merged 3 commits into

masteractiveadmin-plugins/active_admin_import:masterfrom

chore/drop-eol-ruby-rails-add-8.1-ruby4activeadmin-plugins/active_admin_import:chore/drop-eol-ruby-rails-add-8.1-ruby4Copy head branch name to clipboard