ViewsBlockItemsPerPageNoneToNullRector

Replace $block->setConfigurationValue('items_per_page', 'none') with NULL for Views block plugins.

-$block->setConfigurationValue('items_per_page', 'none');
+$block->setConfigurationValue('items_per_page', NULL);

Configure your rector.php:

<?php

use DrupalRector\Drupal11\Rector\Deprecation\ViewsBlockItemsPerPageNoneToNullRector;
use Rector\Config\RectorConfig;

return RectorConfig::configure()
    ->withRules([
        ViewsBlockItemsPerPageNoneToNullRector::class,
    ]);

Other rules in the drupal/core 11.2 set