PHP Deprecated since PHP 8.1

Hello,

There is a PHP Deprecated message in your plugin, since PHP 8.1:

str_replace(): Passing null to parameter #2 ($replace) of type array|string is deprecated in /qty-increment-buttons-for-woocommerce/qty-increment-buttons-for-woocommerce.php on line 395

On this line:

$replacedKeys = str_replace('qib_', null, array_keys( $array ));

Please can you fix it and make a new release of the plugin once fixed?

Thanks.