7 files declare their use of ConfigEntityUpdater

ConfigEntityUpdaterTest.php in core/tests/Drupal/KernelTests/Core/Config/Entity/ConfigEntityUpdaterTest.php
content_translation.post_update.php in core/modules/content_translation/content_translation.post_update.php
Post update functions for Content Translation.
filter.post_update.php in core/modules/filter/filter.post_update.php
Post update functions for Filter.
text.post_update.php in core/modules/text/text.post_update.php
Contains post update hooks for the text module.
user.post_update.php in core/modules/user/user.post_update.php
Post update functions for User module.
views.post_update.php in core/modules/views/views.post_update.php
Post update functions for Views.
views_test_config_updater.post_update.php in core/modules/views/tests/modules/views_test_config_updater/views_test_config_updater.post_update.php

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