mysql9 修改密码报错：plugin 'mysql_native_password' is not loaded

原解决方案：https://github.com/Homebrew/homebrew-core/issues/180498

mysql9的密码加密方式已改变，没有了mysql_native_password，应该使用caching_sha2_password

执行以下sql：

ALTER USER 'root'@'localhost' IDENTIFIED WITH caching_sha2_password BY '新密码';

FLUSH PRIVILEGES;