6 files declare their use of GarageInterface in GraphQL 8.3

BuyCar.php in tests/modules/graphql_plugin_test/src/Plugin/GraphQL/Mutations/BuyCar.php

Garage.php in tests/modules/graphql_plugin_test/src/Plugin/GraphQL/Fields/Garage.php

MutationTest.php in tests/src/Kernel/Extension/MutationTest.php

OverrideTypeTest.php in tests/src/Kernel/Extension/OverrideTypeTest.php

RecursiveTypeTest.php in tests/src/Kernel/Extension/RecursiveTypeTest.php

TypeTest.php in tests/src/Kernel/Extension/TypeTest.php