In jst_cache, use ...arguments syntax instaed of .apply() and .concat()

diff --git a/jst_cache b/jst_cache
index f8c4f31..a64c232 160000 (submodule)
--- a/jst_cache
+++ b/jst_cache
@@ -1 +1 @@
-Subproject commit f8c4f3165294f1a58f03755def8b419f643f2077
+Subproject commit a64c23283dc8b2a2b577e8daf4af3822e66f2e1e