fix get bulk uri

app/routers/delete/delete_bulk_data.py

@@ -29,8 +29,8 @@ async def _get_bulk_uri_from_version(ctx: Context, bulk_uri_access: BulkIdAccess
                                      record_versions):
     version = record_versions.versions[index]
     record_from_version = await fetch_record(ctx, record_id, version)
-    bulk_uri, prefix = bulk_uri_access.get_bulk_uri(record=record_from_version)
-    return bulk_uri
+    obj_bulk_uri = bulk_uri_access.get_bulk_uri(record=record_from_version)
+    return obj_bulk_uri.encode()
 
 
 async def _get_bulk_uris_of_versions_from_record_id(ctx: Context,