6 files declare their use of CasUserManager in CAS 8

BulkAddCasUsers.php in src/Form/BulkAddCasUsers.php

CasProtectedUserFieldConstraintValidator.php in src/Plugin/Validation/Constraint/CasProtectedUserFieldConstraintValidator.php

CasSettings.php in src/Form/CasSettings.php

CasUserAccessCheck.php in src/Access/CasUserAccessCheck.php

CasUserManagerTest.php in tests/src/Unit/Service/CasUserManagerTest.php

ServiceController.php in src/Controller/ServiceController.php