chore: update deps (#14)

* chore: update deps

* update usage of renamed sets

* update rulesets to auto and re-apply CS

* re-enable the rule

chore: upgrade deps, drop symfony/phpunit-bridge (#11)

DX: drop deprecated BashScriptExecutor (#6)

DX: maintenance (#5)

* DX: update PHP and deps

* CI

* update CS fixer

* apply CS

* migrate to PHP 7.1

* allow PHPUnit Bridge ^6 too

Allow PHP 8 and PHPUnit 8+9 (#4)

Allow Symfony 5 + fix using the Process class (#3)