Issue #3216238 by Fernly, mpp: Use of removed function drupal_basename() in Drupal 9

Closes #3216238

src/Plugin/migrate/html/process/HtmlTagImgProcess.php

@@ -255,7 +255,7 @@ abstract class HtmlTagImgProcess extends HtmlTagProcess {
     }
 
     // Construct the full file path to the source file.
-    $source_name = drupal_basename($source);
+    $source_name = \Drupal::service('file_system')->basename($source);
 
     if (file_exists($source)) {
       // Make sure that the target folder exists and is writable.
@@ -366,7 +366,7 @@ abstract class HtmlTagImgProcess extends HtmlTagProcess {
       $client = \Drupal::httpClient();
       $request = $client->get($source);
       $data = $request->getBody()->getContents();
-      $file_name = drupal_basename($source);
+      $file_name = \Drupal::service('file_system')->basename($source);
       $file = $this->createFile($data, $target_folder . '/' . $file_name, $replace);
     }
     catch (\Exception $e) {