Upgrade QUnit: Welcome to the present!

diff --git a/test/qunit b/test/qunit
index 900f72051b0112342feda3d700a7a049d886b9ce..6ca3721222109997540bd6d9ccd396902e0ad2f9 160000 (submodule)
--- a/test/qunit
+++ b/test/qunit
@@ -1 +1 @@
-Subproject commit 900f72051b0112342feda3d700a7a049d886b9ce
+Subproject commit 6ca3721222109997540bd6d9ccd396902e0ad2f9