functions.php extension to include only specific plugins in the automatic updates

listing-13-1.php

function auto_update_specific_plugins ( $update, $item ) {
    // List your plugins to be updated here
    $plugins = array ( 
        'cookie-notice',
        'relevanssi',
        'updraftplus',
        'and-any-other-plugin-slugs'
    );
    if ( in_array( $item->slug, $plugins ) ) {
        return true;
    }
    return $update;
}
add_filter( 'auto_update_plugin', 'auto_update_specific_plugins', 10, 2 );