test: add schemas needed for commented out draft-next tests

Author: ChALkeR

test/util/schemas.js

@@ -85,13 +85,15 @@ const remotes = [
   'draft-next/baseUriChange/folderInteger',
   'draft-next/baseUriChangeFolder/folderInteger',
   'draft-next/baseUriChangeFolderInSubschema/folderInteger',
+  'draft-next/extendible-dynamic-ref',
   'draft-next/integer',
   'draft-next/locationIndependentIdentifier',
   'draft-next/name-defs',
   'draft-next/nested/foo-ref-string',
   'draft-next/nested/string',
   'draft-next/ref-and-defs',
   'draft-next/subSchemas-defs',
+  'draft-next/tree',
   'draft2019-09/baseUriChange/folderInteger',
   'draft2019-09/baseUriChangeFolder/folderInteger',
   'draft2019-09/baseUriChangeFolderInSubschema/folderInteger',