PHP 8.4 nullable is deprecated warning

Problem/Motivation

3.0 version of Module is not compatible with php 8.4

Steps to reproduce

Throws warnings on drush cr

PHP Deprecated: Drupal\acquia_search\EventSubscriber\SearchSubscriber::__construct(): Implicitly marking parameter $options as nullable is deprecated, the explicit nullable type must be used instead in /var/www/docroot/modules/contrib/acquia_search/src/EventSubscriber/SearchSubscriber.php on line 94

Deprecated: Drupal\acquia_search\EventSubscriber\SearchSubscriber::__construct(): Implicitly marking parameter $options as nullable is deprecated, the explicit nullable type must be used instead in /var/www/docroot/modules/contrib/acquia_search/src/EventSubscriber/SearchSubscriber.php on line 94

Proposed resolution

Fix php code and make it compatible

Remaining tasks

Merge PR and make the new release.