7 files declare their use of Server in GraphQL 8.4

DisabledResultCacheTest.php in tests/src/Kernel/Framework/DisabledResultCacheTest.php

ExplorerMenuLinkDeriver.php in src/Plugin/MenuLink/Deriver/ExplorerMenuLinkDeriver.php

graphql.install in ./graphql.install

Install, update and uninstall functions for the GraphQL module.

HttpRequestTrait.php in tests/src/Traits/HttpRequestTrait.php

MockingTrait.php in tests/src/Traits/MockingTrait.php

ResultCacheTest.php in tests/src/Kernel/Framework/ResultCacheTest.php

VoyagerMenuLinkDeriver.php in src/Plugin/MenuLink/Deriver/VoyagerMenuLinkDeriver.php