[Compat] Fixes #3578 PHP 8.4 deprecation: Implicitly marking parameter as nullable is deprecated

Author: rbayet

src/module-elasticsuite-catalog-graph-ql/Model/Resolver/Products/Query/Search.php

@@ -79,7 +79,7 @@ public function __construct(
         FieldSelection $fieldSelection,
         ProductSearch $productProvider,
         SearchCriteriaBuilder $searchCriteriaBuilder,
-        Suggestions $suggestions = null
+        ?Suggestions $suggestions = null
     ) {
         $this->search                = $search;
         $this->searchResultFactory   = $searchResultFactory;

src/module-elasticsuite-core/Search/Request/Query/Vector/Opensearch/Neural.php

@@ -72,7 +72,7 @@ public function __construct(
         string $field = self::DEFAULT_EMBEDDING_FIELD,
         ?string $name = null,
         float $boost = QueryInterface::DEFAULT_BOOST_VALUE,
-        string $modelId = null
+        ?string $modelId = null
     ) {
         $this->field     = $field;
         $this->queryText = $queryText;