class SomeObject
 {
-    public function run($optional = 1, $required)
+    public function run($required, $optional = 1)
     {
     }
 }

Configure your rector.php:

<?php

use Rector\CodeQuality\Rector\ClassMethod\OptionalParametersAfterRequiredRector;
use Rector\Config\RectorConfig;

return RectorConfig::configure()
    ->withRules([
        OptionalParametersAfterRequiredRector::class,
    ]);

SETS:  PHP 8.0 Code Quality