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Configurable

FileManagedFileSubmitRector

Replace deprecated 'file_managed_file_submit' string callback with [\Drupal\file\Element\ManagedFile::class, 'submit'] array callable

-$form['upload']['#submit'] = ['file_managed_file_submit'];
+$form['upload']['#submit'] = [[\Drupal\file\Element\ManagedFile::class, 'submit']];

Configure your rector.php:

<?php

use DrupalRector\Drupal11\Rector\Deprecation\FileManagedFileSubmitRector;
use DrupalRector\Rector\ValueObject\DrupalIntroducedVersionConfiguration;
use Rector\Config\RectorConfig;

return RectorConfig::configure()
    ->withConfiguredRule(FileManagedFileSubmitRector::class, [
        new DrupalIntroducedVersionConfiguration('11.3.0'),
    ]);