Run PHP-CS-Fixer in parallel (#9739)

* Run PHP-CS-Fixer in parallel

* Use use, just like the rest of the code

Author: melroy89

.php-cs-fixer.dist.php

@@ -2,6 +2,7 @@
 
 use PhpCsFixer\Config;
 use PhpCsFixer\Finder;
+use PhpCsFixer\Runner\Parallel\ParallelConfigFactory;
 
 $finder = Finder::create()
     ->in([__DIR__])
@@ -14,6 +15,7 @@
     ->name('*.sh');
 
 return (new Config())
+    ->setParallelConfig(ParallelConfigFactory::detect())
     ->setRiskyAllowed(true)
     ->setRules([
         '@PhpCsFixer' => true,