8 files declare their use of ProcessEvent in Feeds 8.3

FeedsExecutable.php in src/FeedsExecutable.php

FeedsExecutableTest.php in tests/src/Unit/FeedsExecutableTest.php

FeedsSubscriber.php in tests/modules/feeds_test_events/src/EventSubscriber/FeedsSubscriber.php

FeedSubscriber.php in tests/modules/feeds_test_multiple_cron_runs/src/EventSubscriber/FeedSubscriber.php

LazySubscriber.php in src/EventSubscriber/LazySubscriber.php

LazySubscriberTest.php in tests/src/Unit/EventSubscriber/LazySubscriberTest.php

ProcessEventTest.php in tests/src/Unit/Event/ProcessEventTest.php

UpdateNonExistentTest.php in tests/src/Functional/UpdateNonExistentTest.php