Build: Update Sizzle to 2.3.3

Fixes gh-3263

external/sizzle/dist/sizzle.js

@@ -1,5 +1,5 @@
 /*!
- * Sizzle CSS Selector Engine v2.3.2
+ * Sizzle CSS Selector Engine v2.3.3
  * https://sizzlejs.com/
  *
  * Copyright jQuery Foundation and other contributors
@@ -179,7 +179,7 @@ var i,
 
 	disabledAncestor = addCombinator(
 		function( elem ) {
-			return elem.disabled === true;
+			return elem.disabled === true && ("form" in elem || "label" in elem);
 		},
 		{ dir: "parentNode", next: "legend" }
 	);