Updated all dependencies and prepared for PHP 8

classes/DI/DependencyInjector.php

@@ -14,7 +14,7 @@ use Psr\Http\Message\RequestInterface, Psr\Http\Message\ResponseInterface;
 use DI\ContainerBuilder;
 use Doctrine\Common\Collections\ArrayCollection;
 use Doctrine\Common\Cache\FilesystemCache;
-use Slim\Http\Response;
+use Slim\Psr7\Response;
 use Symfony\Component\Mailer\MailerInterface,
     Symfony\Component\Mailer\Transport, Symfony\Component\Mailer\Mailer;
 use CloudObjects\SDK\ObjectRetriever, CloudObjects\SDK\NodeReader, CloudObjects\SDK\COIDParser;