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6 files declare their use of OptGroup in Drupal 9

EntityReferenceItem.php in core/lib/Drupal/Core/Field/Plugin/Field/FieldType/EntityReferenceItem.php
InOperator.php in core/modules/views/src/Plugin/views/filter/InOperator.php
ListItemBase.php in core/modules/options/src/Plugin/Field/FieldType/ListItemBase.php
OptGroupTest.php in core/tests/Drupal/Tests/Core/Form/OptGroupTest.php
OptionsDefaultFormatter.php in core/modules/options/src/Plugin/Field/FieldFormatter/OptionsDefaultFormatter.php
OptionsWidgetBase.php in core/lib/Drupal/Core/Field/Plugin/Field/FieldWidget/OptionsWidgetBase.php