12 files declare their use of ModerationInformationInterface in Drupal 9

ContentModeration.php in core/modules/content_moderation/src/Plugin/WorkflowType/ContentModeration.php

ContentModerationConfigureEntityTypesForm.php in core/modules/content_moderation/src/Form/ContentModerationConfigureEntityTypesForm.php

ContentModerationConfigureForm.php in core/modules/content_moderation/src/Form/ContentModerationConfigureForm.php

ContentModerationStateFormatter.php in core/modules/content_moderation/src/Plugin/Field/FieldFormatter/ContentModerationStateFormatter.php

DynamicLocalTasks.php in core/modules/content_moderation/src/Plugin/Derivative/DynamicLocalTasks.php

EntityModerationForm.php in core/modules/content_moderation/src/Form/EntityModerationForm.php

LatestRevisionCheck.php in core/modules/content_moderation/src/Access/LatestRevisionCheck.php

ModerationOptOutPublish.php in core/modules/content_moderation/src/Plugin/Action/ModerationOptOutPublish.php

ModerationOptOutUnpublish.php in core/modules/content_moderation/src/Plugin/Action/ModerationOptOutUnpublish.php

ModerationStateConstraintValidator.php in core/modules/content_moderation/src/Plugin/Validation/Constraint/ModerationStateConstraintValidator.php

NodeModerationHandler.php in core/modules/content_moderation/src/Entity/Handler/NodeModerationHandler.php

StateTransitionValidationTest.php in core/modules/content_moderation/tests/src/Unit/StateTransitionValidationTest.php