TP6.0.x升级报错：Script @php think service:discover handling the post-autoload-dump event returned with error code 255

报错完整信息为：

Deprecated: Method ReflectionParameter::getClass() is deprecated in /vendor/topthink/think-container/src/Container.php on line 450
Script @php think service:discover handling the post-autoload-dump event returned with error code 255

这是因为在PHP8.0以后反射类ReflectionParameter::getClass() 已弃用，变更为getType()。
只要找到文件vendor/topthink/think-container/src/Container.php修改替换即可。
如下图：

详情见：https://github.com/top-think/framework/commit/df4a07d2f51307a6fabdf75dc5b4b7f8b0ad8af8