remove use of internal method

rails/rails@fb30df9

lib/odbc_adapter/database_statements.rb

@@ -128,7 +128,7 @@ def nullability(col_name, is_nullable, nullable)
     end
 
     def prepared_binds(binds)
-      prepare_binds_for_database(binds).map { |bind| _type_cast(bind) }
+      binds.map(&:value_for_database).map { |bind| _type_cast(bind) }
     end
   end
 end