Update vendor files to fix build failure

Signed-off-by: Chifeng Cai <frcai@microsoft.com>

vendor/golang.org/x/net/html/parse.go

@@ -840,6 +840,10 @@ func afterHeadIM(p *parser) bool {
 
 	p.parseImpliedToken(StartTagToken, a.Body, a.Body.String())
 	p.framesetOK = true
+	if p.tok.Type == ErrorToken {
+		// Stop parsing.
+		return true
+	}
 	return false
 }
 
@@ -1031,7 +1035,7 @@ func inBodyIM(p *parser) bool {
 			if p.tok.DataAtom == a.Input {
 				for _, t := range p.tok.Attr {
 					if t.Key == "type" {
-						if strings.ToLower(t.Val) == "hidden" {
+						if strings.EqualFold(t.Val, "hidden") {
 							// Skip setting framesetOK = false
 							return true
 						}
@@ -1459,7 +1463,7 @@ func inTableIM(p *parser) bool {
 			return inHeadIM(p)
 		case a.Input:
 			for _, t := range p.tok.Attr {
-				if t.Key == "type" && strings.ToLower(t.Val) == "hidden" {
+				if t.Key == "type" && strings.EqualFold(t.Val, "hidden") {
 					p.addElement()
 					p.oe.pop()
 					return true