Sizzle: make html from assertions xhtml compliant. Fixes #12359.

diff --git a/src/sizzle b/src/sizzle
index 1a8321f7cf38ab029fd12f3f2e6fb09061f3c05c..7a6754daa0786f2c9dbf7e9bbf250a8c78fa53df 160000 (submodule)
--- a/src/sizzle
+++ b/src/sizzle
@@ -1 +1 @@
-Subproject commit 1a8321f7cf38ab029fd12f3f2e6fb09061f3c05c
+Subproject commit 7a6754daa0786f2c9dbf7e9bbf250a8c78fa53df