Dowgraded and Scoped version by Default

Since 9.3.3, the package is downgraded to PHP 7.1 and scoped. The former package https://github.com/symplify/easy-coding-standard-prefixed is deprecated and replaced by symplify/easy-coding-standard should be used instead.

Read more in standalone post https://tomasvotruba.com/blog/introducing-ecs-prefixed-and-downgraded-to-php-71