Update Sizzle: IE6-8 traversing test fix

diff --git a/src/sizzle b/src/sizzle
index 7d195c771898eb9711b2fa52083da2613856dacc..3bc4139352cd65d6f01ce0601b24d230b219e792 160000 (submodule)
--- a/src/sizzle
+++ b/src/sizzle
@@ -1 +1 @@
-Subproject commit 7d195c771898eb9711b2fa52083da2613856dacc
+Subproject commit 3bc4139352cd65d6f01ce0601b24d230b219e792