PHP 8.4 implicit type deprecations

Problem/Motivation

Hello,

currently when using php 8.4 after each and every drush cr I get deprecation warnings:

Drupal\user_registrationpassword\Plugin\rest\resource\RegistrationPasswordResource::post(): Implicitly marking parameter $account as nullable is deprecated, the explicit nullable type must be used instead in /var/www/html/web/modules/contrib/user_registrationpassword/src/Plugin/rest/resource/RegistrationPasswordResource.php on line 112
PHP Deprecated:  Drupal\user_registrationpassword\Plugin\rest\resource\RegistrationPasswordResource::ensureAccountCanRegister(): Implicitly marking parameter $account as nullable is deprecated, the explicit nullable type must be used instead in /var/www/html/web/modules/contrib/user_registrationpassword/src/Plugin/rest/resource/RegistrationPasswordResource.php on line 134

Thank you