6 files declare their use of Link

EntityResource.php in core/modules/jsonapi/src/Controller/EntityResource.php
EntryPoint.php in core/modules/jsonapi/src/Controller/EntryPoint.php
FileUpload.php in core/modules/jsonapi/src/Controller/FileUpload.php
LinkCollectionNormalizer.php in core/modules/jsonapi/src/Normalizer/LinkCollectionNormalizer.php
LinkTest.php in core/modules/jsonapi/tests/src/Unit/JsonApiResource/LinkTest.php
ResourceTestBase.php in core/modules/jsonapi/tests/src/Functional/ResourceTestBase.php

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