6 files declare their use of KernelServiceTestBase in Purge 8.3

ServiceSmokeAndFireTest.php in tests/src/Kernel/DiagnosticCheck/ServiceSmokeAndFireTest.php

ServiceTest.php in tests/src/Kernel/Processor/ServiceTest.php

ServiceTest.php in tests/src/Kernel/Queue/ServiceTest.php

ServiceTest.php in tests/src/Kernel/TagsHeader/ServiceTest.php

ServiceTest.php in tests/src/Kernel/Queuer/ServiceTest.php

ServiceTest.php in tests/src/Kernel/DiagnosticCheck/ServiceTest.php