Revert "Update deps"

This reverts commit 915c90ae37.

The x/sys update breaks compilation on arm

vendor/github.com/miekg/dns/labels.go

@@ -126,23 +126,20 @@ func Split(s string) []int {
 // The bool end is true when the end of the string has been reached.
 // Also see PrevLabel.
 func NextLabel(s string, offset int) (i int, end bool) {
-	if s == "" {
-		return 0, true
-	}
+	quote := false
 	for i = offset; i < len(s)-1; i++ {
-		if s[i] != '.' {
-			continue
+		switch s[i] {
+		case '\\':
+			quote = !quote
+		default:
+			quote = false
+		case '.':
+			if quote {
+				quote = !quote
+				continue
+			}
+			return i + 1, false
 		}
-		j := i - 1
-		for j >= 0 && s[j] == '\\' {
-			j--
-		}
-
-		if (j-i)%2 == 0 {
-			continue
-		}
-
-		return i + 1, false
 	}
 	return i + 1, true
 }
@@ -152,38 +149,17 @@ func NextLabel(s string, offset int) (i int, end bool) {
 // The bool start is true when the start of the string has been overshot.
 // Also see NextLabel.
 func PrevLabel(s string, n int) (i int, start bool) {
-	if s == "" {
-		return 0, true
-	}
 	if n == 0 {
 		return len(s), false
 	}
-
-	l := len(s) - 1
-	if s[l] == '.' {
-		l--
+	lab := Split(s)
+	if lab == nil {
+		return 0, true
 	}
-
-	for ; l >= 0 && n > 0; l-- {
-		if s[l] != '.' {
-			continue
-		}
-		j := l - 1
-		for j >= 0 && s[j] == '\\' {
-			j--
-		}
-
-		if (j-l)%2 == 0 {
-			continue
-		}
-
-		n--
-		if n == 0 {
-			return l + 1, false
-		}
+	if n > len(lab) {
+		return 0, true
 	}
-
-	return 0, n > 1
+	return lab[len(lab)-n], false
 }
 
 // equal compares a and b while ignoring case. It returns true when equal otherwise false.