fix: update ActiveRecord adapter w/ support for Rails 7.2+ (#478)

In ActiveRecord 7.2 the `clear_active_connections` was (re)moved to the `connection_handler` property.

lib/graphiti/adapters/active_record.rb

@@ -304,7 +304,11 @@ def destroy(model_instance)
       end
 
       def close
-        ::ActiveRecord::Base.clear_active_connections!
+        if ::ActiveRecord.version > 7.2
+          ::ActiveRecord::Base.connection_handler.clear_active_connections!
+        else
+          ::ActiveRecord::Base.clear_active_connections!
+        end
       end
 
       def can_group?