Fix deprecated nullable type declarations in ComposerLocator and ReflectionProperty

Co-authored-by: lisachenko <[email protected]>

Author: Copilot

src/Locator/ComposerLocator.php

@@ -28,7 +28,7 @@ class ComposerLocator implements LocatorInterface
      */
     private $loader;
 
-    public function __construct(ClassLoader $composerLoader = null)
+    public function __construct(?ClassLoader $composerLoader = null)
     {
         if ($composerLoader === null) {
             $loaders = spl_autoload_functions();

src/ReflectionProperty.php

@@ -68,8 +68,8 @@ class ReflectionProperty extends BaseReflectionProperty
     public function __construct(
         string             $className,
         string             $propertyName,
-        Property|Param     $propertyOrPromotedParam = null,
-        PropertyItem|Param $propertyItemOrPromotedParam = null
+        Property|Param|null     $propertyOrPromotedParam = null,
+        PropertyItem|Param|null $propertyItemOrPromotedParam = null
     ) {
         $this->className = ltrim($className, '\\');
         if (!$propertyOrPromotedParam || !$propertyItemOrPromotedParam) {