7 files declare their use of SlickManagerInterface in Slick Carousel 7.3

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

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

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

SlickSettingsForm.php in slick_ui/src/Form/SlickSettingsForm.php

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