Fix deprecated File::url(), use createFileUrl() instead (#855)

* islandora.tokens.inc
* See https://www.drupal.org/node/3019830
Co-authored-by: Ant Brown <ant@catalyst.net.nz>

islandora.tokens.inc

@@ -79,7 +79,7 @@ function islandora_tokens($type, $tokens, array $data, array $options, Bubbleabl
           if ($media) {
             $file = \Drupal::service('islandora.media_source_service')->getSourceFile($media);
             if (!empty($file)) {
-              $url = $file->url();
+              $url = $file->createFileUrl();
               $replacements[$original] = $url;
             }
           }