11 files declare their use of State in Feeds 8.3

CleanState.php in src/Feeds/State/CleanState.php

CsvParserTest.php in tests/src/Unit/Feeds/Parser/CsvParserTest.php

DirectoryFetcherTest.php in tests/src/Unit/Feeds/Fetcher/DirectoryFetcherTest.php

EntityProcessorBaseTest.php in tests/src/Kernel/Feeds/Processor/EntityProcessorBaseTest.php

Feed.php in src/Entity/Feed.php

FeedClearHandlerTest.php in tests/src/Unit/FeedClearHandlerTest.php

FeedExpireHandlerTest.php in tests/src/Unit/FeedExpireHandlerTest.php

HttpFetcherTest.php in tests/src/Unit/Feeds/Fetcher/HttpFetcherTest.php

SitemapParserTest.php in tests/src/Unit/Feeds/Parser/SitemapParserTest.php

StateTest.php in tests/src/Unit/StateTest.php

SyndicationParserTest.php in tests/src/Unit/Feeds/Parser/SyndicationParserTest.php