7 files declare their use of NodeUpdateMethod in GatherContent 8.4

ContentImportSelectForm.php in gathercontent_ui/src/Form/ContentImportSelectForm.php

ContentProcessor.php in src/Import/ContentProcess/ContentProcessor.php

ContentProcessorTest.php in tests/src/Kernel/ContentProcessorTest.php

ContentUpdateConfirmForm.php in gathercontent_ui/src/Form/ContentUpdateConfirmForm.php

gathercontent.drush.inc in ./gathercontent.drush.inc

Drush command to cli config import.

ImportConfigForm.php in src/Form/ImportConfigForm.php

ImporterTest.php in tests/src/Kernel/ImporterTest.php