chore: remove parallel configuration as it causes issues in rpc mode

Author: soyuka

.php-cs-fixer.dist.php

@@ -29,7 +29,6 @@
     ]);
 
 return (new PhpCsFixer\Config())
-    ->setParallelConfig(PhpCsFixer\Runner\Parallel\ParallelConfigFactory::detect())
     ->setRiskyAllowed(true)
     ->setRules([
         '@DoctrineAnnotation' => true,