drupal/core/modules/field/field.post_update.php

<?php

/**
 * @file
 * Post update functions for Field module.
 */

/**
 * Implements hook_removed_post_updates().
 */
function field_removed_post_updates() {
  return [
    'field_post_update_save_custom_storage_property' => '9.0.0',
    'field_post_update_entity_reference_handler_setting' => '9.0.0',
    'field_post_update_email_widget_size_setting' => '9.0.0',
    'field_post_update_remove_handler_submit_setting' => '9.0.0',
  ];
}