6 files declare their use of DeriverInterface in Drupal 10

ContainerDeriverInterface.php in core/lib/Drupal/Core/Plugin/Discovery/ContainerDeriverInterface.php

MockLayoutBlockDeriver.php in core/modules/system/tests/modules/plugin_test/src/Plugin/plugin_test/mock_block/MockLayoutBlockDeriver.php

MockMenuBlockDeriver.php in core/modules/system/tests/modules/plugin_test/src/Plugin/plugin_test/mock_block/MockMenuBlockDeriver.php

TestDerivativeDiscovery.php in core/tests/Drupal/Tests/Core/Plugin/Discovery/TestDerivativeDiscovery.php

TestDerivativeDiscoveryWithObject.php in core/tests/Drupal/Tests/Core/Plugin/Discovery/TestDerivativeDiscoveryWithObject.php

TestHelpTopicDeriver.php in core/modules/help_topics/tests/modules/help_topics_test/src/Plugin/Deriver/TestHelpTopicDeriver.php