7 files declare their use of QuickTabsInstance in Quick Tabs 8.3

AccordionTabs.php in quicktabs_accordion/src/Plugin/TabRenderer/AccordionTabs.php

QuickTabs.php in src/Plugin/TabRenderer/QuickTabs.php

QuicktabsConfigSchemaTest.php in tests/src/Kernel/QuicktabsConfigSchemaTest.php

QuickTabsInstanceEditForm.php in src/Form/QuickTabsInstanceEditForm.php

TabRendererBase.php in src/TabRendererBase.php

TabRendererInterface.php in src/TabRendererInterface.php

UiTabs.php in quicktabs_jqueryui/src/Plugin/TabRenderer/UiTabs.php