请求缓存设置的缓存标签无效

[wxkxklmyt]

https://github.com/top-think/framework/blob/9cb47919f59f080e39ec2b8401e4f9c11c8548fb/src/think/middleware/CheckRequestCache.php#L77

$tag = null; 会导致应用配置（app/index/config/route.php）的请求缓存标签无效，建议更改为 $tag = $this->config['request_cache_tag']; 另外还有一个疑问 https://github.com/top-think/framework/blob/9cb47919f59f080e39ec2b8401e4f9c11c8548fb/src/think/middleware/CheckRequestCache.php#L102 $tag没有hash，实际缓存时，缓存标签KEY却是hash过的，没看到代码用的md5函数