upgraded core, fixed customs modules

web/modules/custom/materio_sapi/materio_sapi.info.yml

@@ -1,7 +1,7 @@
 name: Materio Serach API
 type: module
 description: 'Search Api Materio module'
-core: 8.x
+core_version_requirement: ^8.8 || ^9.2
 package: 'Materio'
 dependencies:
   - search_api

web/modules/custom/materio_sapi/src/Controller/Base.php

@@ -260,7 +260,7 @@ class Base extends ControllerBase {
     // Get the typed string from the URL, if it exists.
     $this->keys = $request->query->get('keys');
     if($this->keys){
-      $this->keys = Unicode::strtolower($this->keys);
+      $this->keys = mb_strtolower($this->keys);
       // $this->keys = Tags::explode($this->keys);
       \Drupal::logger('materio_sapi')->notice($this->keys);
     }