drupal/core/modules/block/block.post_update.php

<?php

/**
 * @file
 * Post update functions for Block.
 */

/**
 * Implements hook_removed_post_updates().
 */
function block_removed_post_updates() {
  return [
    'block_post_update_disable_blocks_with_missing_contexts' => '9.0.0',
    'block_post_update_disabled_region_update' => '9.0.0',
    'block_post_update_fix_negate_in_conditions' => '9.0.0',
  ];
}

/**
 * Updates the node type visibility condition.
 */
function block_post_update_replace_node_type_condition() {
  $config_factory = \Drupal::configFactory();
  foreach ($config_factory->listAll('block.block.') as $block_config_name) {
    $block = $config_factory->getEditable($block_config_name);

    if ($block->get('visibility.node_type')) {
      $configuration = $block->get('visibility.node_type');
      $configuration['id'] = 'entity_bundle:node';
      $block->set('visibility.entity_bundle:node', $configuration);
      $block->clear('visibility.node_type');
      $block->save(TRUE);
    }
  }
}