8 files declare their use of ResourceObject in Drupal 10

EntityAccessChecker.php in core/modules/jsonapi/src/Access/EntityAccessChecker.php

EntityResource.php in core/modules/jsonapi/src/Controller/EntityResource.php

FileUpload.php in core/modules/jsonapi/src/Controller/FileUpload.php

IncludeResolver.php in core/modules/jsonapi/src/IncludeResolver.php

LinkCollectionNormalizerTest.php in core/modules/jsonapi/tests/src/Kernel/Normalizer/LinkCollectionNormalizerTest.php

ResourceObjectNormalizationCacher.php in core/modules/jsonapi/src/EventSubscriber/ResourceObjectNormalizationCacher.php

ResourceObjectNormalizerCacherTest.php in core/modules/jsonapi/tests/src/Kernel/EventSubscriber/ResourceObjectNormalizerCacherTest.php

ResourceTestBase.php in core/modules/jsonapi/tests/src/Functional/ResourceTestBase.php