-$form['#submit'][] = 'automated_cron_settings_submit';
 $form['#submit'][] = 'mymodule_settings_submit';

<?php

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

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

Other rules in the drupal/core 11.4 set

• RemoveDrupalToStringTraitRector - Replace use of deprecated Drupal\Component\Utility\ToStringTrait with a direct __toString() method.
• ReplaceNonBoolAccessRector - Replace integer #access values with proper booleans in render arrays.
• GetDrupalRootToRootPropertyRector - Replace deprecated DrupalTestCaseTrait::getDrupalRoot() calls with $this->root property access in Drupal test classes.
• SystemSortThemesRector - Replace deprecated system_sort_themes() string callback with an inline static closure
• ReplaceHideShowWithPrintedRector - Replace deprecated global hide() and show() functions with direct #printed property assignment on the render element.
• RemoveCacheExpireOverrideRector - Remove deprecated cacheExpire() overrides from Views CachePluginBase subclasses
• RemoveToolkitArgFromImageToolkitOperationConstructorRector - Remove deprecated $toolkit argument from ImageToolkitOperationBase::__construct(). The toolkit is now injected via setToolkit() by the plugin manager.
• RemoveLinkWidgetValidateTitleElementRector - Removes deprecated LinkWidget::validateTitleElement() calls. Validation is now handled by LinkTitleRequiredConstraint on the LinkItem field type (drupal:11.4.0)
• UserLoadByNameAndMailRector - Replaces deprecated user_load_by_name() and user_load_by_mail() with entity storage loadByProperties()
• RemoveInstallSchemaSystemSequencesRector - Remove deprecated KernelTestBase::installSchema('system', 'sequences') calls; the sequences table was removed in Drupal 12.