8 files declare their use of ConfigurableTargetInterface in Feeds 8.3

ConfigEntityReference.php in src/Feeds/Target/ConfigEntityReference.php

DateTargetBase.php in src/Feeds/Target/DateTargetBase.php

Email.php in src/Feeds/Target/Email.php

EntityReference.php in src/Feeds/Target/EntityReference.php

FeedType.php in src/Entity/FeedType.php

MappingForm.php in src/Form/MappingForm.php

Password.php in src/Feeds/Target/Password.php

Text.php in src/Feeds/Target/Text.php