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drupal/core 11.1

BlockContentTestBaseStringToArrayRector

Replace deprecated string $values in BlockContentTestBase::createBlockContentType() with an ['id' => ...] array

-$this->createBlockContentType('basic', TRUE);
+$this->createBlockContentType(['id' => 'basic'], TRUE);

Configure your rector.php:

<?php

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

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

Other rules in the drupal/core 11.1 set