Update PHP-CS-Fixer rules to correct migration config names

Author: xmarchegay

.php-cs-fixer.dist.php

@@ -24,8 +24,8 @@
 
 return (new PhpCsFixer\Config())
     ->setRules([
-        '@PHP82Migration' => true,
-        '@PHPUnit75Migration:risky' => true,
+        '@PHP8x2Migration' => true,
+        '@PHPUnit7x5Migration:risky' => true,
         '@Symfony' => true,
         '@Symfony:risky' => true,
         'protected_to_private' => false,