8 files declare their use of QueuerBase in Purge 8.3

AQueuer.php in tests/modules/purge_queuer_test/src/Plugin/Purge/Queuer/AQueuer.php

BQueuer.php in tests/modules/purge_queuer_test/src/Plugin/Purge/Queuer/BQueuer.php

CacheTagsQueuerTest.php in modules/purge_queuer_coretags/tests/src/Unit/CacheTagsQueuerTest.php

CoreTagsQueuer.php in modules/purge_queuer_coretags/src/Plugin/Purge/Queuer/CoreTagsQueuer.php

CQueuer.php in tests/modules/purge_queuer_test/src/Plugin/Purge/Queuer/CQueuer.php

DrushQueueAddQueuer.php in modules/purge_drush/src/Plugin/Purge/Queuer/DrushQueueAddQueuer.php

PurgeBlockQueuer.php in modules/purge_ui/src/Plugin/Purge/Queuer/PurgeBlockQueuer.php

WithFormQueuer.php in tests/modules/purge_queuer_test/src/Plugin/Purge/Queuer/WithFormQueuer.php