Remove used ActiveRecord::Result method

Fix: rails#54699

Author: byroot

activerecord/lib/active_record/result.rb

@@ -238,11 +238,6 @@ def indexed_rows # :nodoc:
       end
     end
 
-    protected
-      def raw_column_types
-        @column_types
-      end
-
     private
       def column_type(name, index, type_overrides)
         if type_overrides