Fix phpmyadmin error when used PHP8

1. Deprecation Notice in ./libraries/classes/Di/ReflectorItem.php#82
Method ReflectionParameter::getClass() is deprecated

修复：
nano /usr/share/phpmyadmin/libraries/classes/Di/ReflectorItem.php

Search:   $type = $param->getClass();
Replace as: $type = $param->getType();

2. 使用配置文件中定义的控制用户连接失败 解决方法
nano /etc/phpmyadmin/config-db.php

$dbuser=’ROOTUSER’;
$dbpass=’PASSWORD’;