8 files declare their use of ConfigTarget

BookSettingsForm.php in core/modules/book/src/Form/BookSettingsForm.php
ConfigTargetTest.php in core/tests/Drupal/Tests/Core/Form/ConfigTargetTest.php
JsonApiSettingsForm.php in core/modules/jsonapi/src/Form/JsonApiSettingsForm.php
LocaleSettingsForm.php in core/modules/locale/src/Form/LocaleSettingsForm.php
MediaSettingsForm.php in core/modules/media/src/Form/MediaSettingsForm.php
NestedConfigTargetForm.php in core/modules/system/tests/modules/form_test/src/Form/NestedConfigTargetForm.php
RegionalForm.php in core/modules/system/src/Form/RegionalForm.php
UpdateSettingsForm.php in core/modules/update/src/UpdateSettingsForm.php

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