7 files declare their use of SlickManagerInterface in Slick Carousel 8

SlickAdmin.php in src/Form/SlickAdmin.php

SlickEntityFormatterBase.php in src/Plugin/Field/FieldFormatter/SlickEntityFormatterBase.php

SlickEntityReferenceFormatterBase.php in src/Plugin/Field/FieldFormatter/SlickEntityReferenceFormatterBase.php

SlickFileFormatterBase.php in src/Plugin/Field/FieldFormatter/SlickFileFormatterBase.php

SlickFormBase.php in slick_ui/src/Form/SlickFormBase.php

SlickListBuilder.php in slick_ui/src/Controller/SlickListBuilder.php

SlickTextFormatter.php in src/Plugin/Field/FieldFormatter/SlickTextFormatter.php