[CssSelector] Fix incorrect return type for Token::getType()

Author: yoeunes

Parser/Token.php

@@ -31,14 +31,20 @@ class Token
     public const TYPE_NUMBER = 'number';
     public const TYPE_STRING = 'string';
 
+    /**
+     * @param self::TYPE_*|null $type
+     */
     public function __construct(
         private ?string $type,
         private ?string $value,
         private ?int $position,
     ) {
     }
 
-    public function getType(): ?int
+    /**
+     * @return self::TYPE_*|null
+     */
+    public function getType(): ?string
     {
         return $this->type;
     }