11 files declare their use of UuidInterface in Drupal 9

BaseFieldOverrideStorage.php in core/lib/Drupal/Core/Field/BaseFieldOverrideStorage.php

ConfigEntityStorage.php in core/lib/Drupal/Core/Config/Entity/ConfigEntityStorage.php

ConfigEntityStorageTest.php in core/tests/Drupal/Tests/Core/Config/Entity/ConfigEntityStorageTest.php

ConfigureBlockFormBase.php in core/modules/layout_builder/src/Form/ConfigureBlockFormBase.php

EntityFormDisplayAccessControlHandlerTest.php in core/tests/Drupal/Tests/Core/Entity/Access/EntityFormDisplayAccessControlHandlerTest.php

FieldConfigStorage.php in core/modules/field/src/FieldConfigStorage.php

FieldStorageConfigAccessControlHandlerTest.php in core/modules/field/tests/src/Unit/FieldStorageConfigAccessControlHandlerTest.php

FieldStorageConfigStorage.php in core/modules/field/src/FieldStorageConfigStorage.php

KeyValueEntityStorage.php in core/lib/Drupal/Core/Entity/KeyValueStore/KeyValueEntityStorage.php

ShortcutSetStorage.php in core/modules/shortcut/src/ShortcutSetStorage.php

UuidTest.php in core/tests/Drupal/Tests/Component/Uuid/UuidTest.php