Update Configuration.php

typecast the $query variable to comply with the PHP 8 standards of [html_entity_decode](https://www.php.net/manual/en/function.html-entity-decode.php)

If the search results page (`/catalogsearch/result`) is requested and the `q` query parameter is not present the page will error.  The code errors when generating the `algoliaConfig` JS variable which means that Algolia can not be instantiated.  This means no products show on the page - the expected result is that a blank search query would be performed and thus a set of products would be displayed.

Author: PromInc

Block/Configuration.php

@@ -254,7 +254,7 @@ public function getConfiguration()
             'autofocus' => true,
             'resultPageUrl' => $this->getCatalogSearchHelper()->getResultUrl(),
             'request' => [
-                'query' =>  htmlspecialchars(html_entity_decode($query)),
+                'query' =>  htmlspecialchars(html_entity_decode((string)$query)),
                 'refinementKey' => $refinementKey,
                 'refinementValue' => $refinementValue,
                 'categoryId' => $categoryId,