fix: add type hint for item parameter in array_map for improved clarity

Author: MrPunyapal

src/Support/JavaScriptSerializer.php

@@ -132,7 +132,7 @@ public static function parseValue(mixed $value): mixed
 
         // Handle arrays
         if (isset($value['a'])) {
-            return array_map(fn ($item): mixed => self::parseValue($item), $value['a']);
+            return array_map(fn (mixed $item): mixed => self::parseValue($item), $value['a']);
         }
 
         // Handle objects