fix: use uuid v4 for filenames to enable distribution to folders

src/Service/Upload/UploadNamer.php

@@ -10,7 +10,7 @@ class UploadNamer implements NamerInterface
 {
     public function name(FileInterface $file): string
     {
-        $fileUuid = Uuid::v7();
+        $fileUuid = Uuid::v4();
         $folder = substr($fileUuid, 0, 1);
 
         return sprintf('%s/%s.%s', $folder, $fileUuid, strtolower($file->getExtension()));