ci: fix orm ut in node18 with macos (#49)

dns lookup with node18 perfer ipv6,localhost
will be resolved to ::1, and mysql listen
bind to 127.0.0.1. It will cause conn refused.
So use 127.0.0.1 instead of localhost.

Author: killagu

plugin/orm/test/fixtures/apps/orm-app/config/config.default.js

@@ -11,7 +11,7 @@ module.exports = function() {
     orm: {
       client: 'mysql',
       database: 'test',
-      host: 'localhost',
+      host: '127.0.0.1',
       port: 3306,
       user: 'root',