Issue #3067312 by mr.baileys, claudiu.cristea: SpreadsheetIterator should not be a service

migrate_spreadsheet.services.yml

-services:
-  migrate_spreadsheet.iterator:
-    class: Drupal\migrate_spreadsheet\SpreadsheetIterator

src/Plugin/migrate/source/Spreadsheet.php

@@ -9,6 +9,7 @@ use Drupal\Core\Plugin\ContainerFactoryPluginInterface;
 use Drupal\migrate\MigrateException;
 use Drupal\migrate\Plugin\migrate\source\SourcePluginBase;
 use Drupal\migrate\Plugin\MigrationInterface;
+use Drupal\migrate_spreadsheet\SpreadsheetIterator;
 use Drupal\migrate_spreadsheet\SpreadsheetIteratorInterface;
 use PhpOffice\PhpSpreadsheet\IOFactory;
 use Symfony\Component\DependencyInjection\ContainerInterface;
@@ -79,7 +80,7 @@ class Spreadsheet extends SourcePluginBase implements ConfigurablePluginInterfac
       $plugin_definition,
       $migration,
       $container->get('file_system'),
-      $container->get('migrate_spreadsheet.iterator')
+      new SpreadsheetIterator()
     );
   }