Apply codestyle and bump version to PER 3.0

Author: SerafimArts

.php-cs-fixer.php

@@ -5,8 +5,8 @@
 
 return (new PhpCsFixer\Config())
     ->setRules([
-        '@PER-CS2.0' => true,
-        '@PER-CS2.0:risky' => true,
+        '@PER-CS3x0' => true,
+        '@PER-CS3x0:risky' => true,
         'strict_param' => true,
         'align_multiline_comment' => true,
         'array_syntax' => [

src/Node/NodeList.php

@@ -29,6 +29,7 @@ public function __construct(
      * to the node list.
      *
      * @param TNode $node
+     *
      * @return int<0, max>|null
      */
     public function findIndex(object $node): ?int