fix(cs): apply style fixes required by PHP-CS-Fixer 3.94.x

Without composer.lock, CI resolves php-cs-fixer 3.94.2 while local
dev environment ran 3.89.2. The newer version adds two rules:

- octal_notation: 0777 => 0o777 (PHP 8.1+ native octal syntax)
  Applies to: DevkitConfigTest.php, MigrationReportTest.php

- class_attributes_separation: blank line between typed class properties
  (ProjectContextTest.php already had this correct)

Updated local php-cs-fixer to 3.94.2 to eliminate version drift.

Author: walmir-silva

tests/Unit/Core/DevkitConfigTest.php

@@ -18,7 +18,7 @@ final class DevkitConfigTest extends TestCase
     protected function setUp(): void
     {
         $this->tmpDir = sys_get_temp_dir() . '/devkit_config_test_' . uniqid();
-        mkdir($this->tmpDir, 0777, true);
+        mkdir($this->tmpDir, 0o777, true);
     }
 
     protected function tearDown(): void

tests/Unit/ValueObject/MigrationReportTest.php

@@ -66,7 +66,7 @@ public function totalItemsCountsAllCategories(): void
     public function removeFilesDeletesExistingFiles(): void
     {
         $tmpDir = sys_get_temp_dir() . '/devkit_test_' . uniqid();
-        mkdir($tmpDir, 0777, true);
+        mkdir($tmpDir, 0o777, true);
 
         $fileToRemove = $tmpDir . '/phpstan.neon';
         file_put_contents($fileToRemove, 'parameters:');