MDL-81660 core: Bump php-css-parser to 8.7.0

lib/php-css-parser/src/Comment/Comment.php

@@ -62,9 +62,11 @@ class Comment implements Renderable
     }
 
     /**
+     * @param OutputFormat|null $oOutputFormat
+     *
      * @return string
      */
-    public function render(OutputFormat $oOutputFormat)
+    public function render($oOutputFormat)
     {
         return '/*' . $this->sComment . '*/';
     }