6 files declare their use of DependencyTrait in Zircon Profile 8

ChangeUserRoleBase.php in core/modules/user/src/Plugin/Action/ChangeUserRoleBase.php

Contains \Drupal\user\Plugin\Action\ChangeUserRoleBase.

Config.php in core/modules/migrate/src/Plugin/migrate/destination/Config.php

Contains \Drupal\migrate\Plugin\migrate\destination\Config.

DrupalSqlBase.php in core/modules/migrate_drupal/src/Plugin/migrate/source/DrupalSqlBase.php

Contains \Drupal\migrate_drupal\Plugin\migrate\source\DrupalSqlBase.

EmptySource.php in core/modules/migrate_drupal/src/Plugin/migrate/source/EmptySource.php

Contains \Drupal\migrate_drupal\Plugin\migrate\source\EmptySource.

Entity.php in core/modules/migrate/src/Plugin/migrate/destination/Entity.php

Contains \Drupal\migrate\Plugin\migrate\destination\Entity.

PluginDependencyTrait.php in core/lib/Drupal/Core/Plugin/PluginDependencyTrait.php

Contains \Drupal\Core\Plugin\PluginDependencyTrait.