Rule source on GitHub

DowngradeFinalPropertyPromotionRector

Change constructor final property promotion to @final tag

 class SomeClass
 {
     public function __construct(
-        final public string $id
-    ){}
+        /** @final */
+        public string $id
+    ) {}
 }

Configure your rector.php:

<?php

use Rector\Config\RectorConfig;
use Rector\DowngradePhp85\Rector\Class_\DowngradeFinalPropertyPromotionRector;

return RectorConfig::configure()
    ->withRules([
        DowngradeFinalPropertyPromotionRector::class,
    ]);