Issue #3076169 by idebr: D6 OptionWidgetsField migrate plugin has wrong namespace

core/modules/options/src/Plugin/migrate/field/d6/OptionWidgetsField.php

 <?php
 
-namespace Drupal\options\Plugin\migrate\field\d7;
+namespace Drupal\options\Plugin\migrate\field\d6;
 
 use Drupal\migrate_drupal\Plugin\migrate\field\FieldPluginBase;