TUN-6937: Bump golang.org/x/* packages to new release tags

vendor/golang.org/x/crypto/ssh/session.go

@@ -13,7 +13,6 @@ import (
 	"errors"
 	"fmt"
 	"io"
-	"io/ioutil"
 	"sync"
 )
 
@@ -124,7 +123,7 @@ type Session struct {
 	// output and error.
 	//
 	// If either is nil, Run connects the corresponding file
-	// descriptor to an instance of ioutil.Discard. There is a
+	// descriptor to an instance of io.Discard. There is a
 	// fixed amount of buffering that is shared for the two streams.
 	// If either blocks it may eventually cause the remote
 	// command to block.
@@ -506,7 +505,7 @@ func (s *Session) stdout() {
 		return
 	}
 	if s.Stdout == nil {
-		s.Stdout = ioutil.Discard
+		s.Stdout = io.Discard
 	}
 	s.copyFuncs = append(s.copyFuncs, func() error {
 		_, err := io.Copy(s.Stdout, s.ch)
@@ -519,7 +518,7 @@ func (s *Session) stderr() {
 		return
 	}
 	if s.Stderr == nil {
-		s.Stderr = ioutil.Discard
+		s.Stderr = io.Discard
 	}
 	s.copyFuncs = append(s.copyFuncs, func() error {
 		_, err := io.Copy(s.Stderr, s.ch.Stderr())