6 files declare their use of FormatterPluginManager in Drupal 9

EditorSelector.php in core/modules/quickedit/src/EditorSelector.php

EntityField.php in core/modules/views/src/Plugin/views/field/EntityField.php

EntityFormDisplayAccessControlHandlerTest.php in core/tests/Drupal/Tests/Core/Entity/Access/EntityFormDisplayAccessControlHandlerTest.php

FieldBlock.php in core/modules/layout_builder/src/Plugin/Block/FieldBlock.php

FieldBlockDeriver.php in core/modules/layout_builder/src/Plugin/Derivative/FieldBlockDeriver.php

FieldBlockTest.php in core/modules/layout_builder/tests/src/Kernel/FieldBlockTest.php