[Php81] Skip dynamic class on NewInInitializerRector

[samsonasik]

Given the following class:

class SkipDynamicNew
{
    private object $stdClass;

    public function __construct(
        string $fallbackClass,
        ?stdClass $stdClass = null
    ) {
        $this->stdClass = $stdClass ?? new $fallbackClass;
    }
}

it produce:

-    private object $stdClass;
-
-    public function __construct(
-        string $fallbackClass,
-        ?stdClass $stdClass = null
-    ) {
-        $this->stdClass = $stdClass ?? new $fallbackClass;
+    public function __construct(string $fallbackClass, private stdClass $stdClass = new $fallbackClass)
+    {
     }

which invalid and cause error:

Fatal error: Cannot use dynamic class name in constant expression

ref https://3v4l.org/RVfne#v8.1.2

[samsonasik]

Fixed 🎉

[samsonasik]

All checks have passed 🎉 @TomasVotruba it is ready for review.

[TomasVotruba]

Thank you 👍