Update dependency phpstan/phpstan to v2.1.51 (#1904)

* Update dependency phpstan/phpstan to v2.1.51

* Avoid redundant Description assertion in PhpEnumType

---------

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>
Co-authored-by: Simon Podlipsky <simon@podlipsky.net>

Author: renovate[bot]

composer.json

@@ -23,7 +23,7 @@
     "nyholm/psr7": "^1.5",
     "phpbench/phpbench": "^1.2",
     "phpstan/extension-installer": "^1.1",
-    "phpstan/phpstan": "2.1.50",
+    "phpstan/phpstan": "2.1.51",
     "phpstan/phpstan-phpunit": "2.0.16",
     "phpstan/phpstan-strict-rules": "2.0.10",
     "phpunit/phpunit": "^9.5 || ^10.5.21 || ^11",

src/Type/Definition/PhpEnumType.php

@@ -108,10 +108,7 @@ protected function extractDescription(\ReflectionClassConstant|\ReflectionClass
         $attributes = $reflection->getAttributes(Description::class);
 
         if (count($attributes) === 1) {
-            $description = $attributes[0]->newInstance();
-            assert($description instanceof Description);
-
-            return $description->description;
+            return $attributes[0]->newInstance()->description;
         }
 
         if (count($attributes) > 1) {