refactor: move from io/ioutil to io and os packages

The io/ioutil package has been deprecated as of Go 1.16 [1]. This commit
replaces the existing io/ioutil functions with their new definitions in
io and os packages.

Reference: https://golang.org/doc/go1.16#ioutil
Signed-off-by: Eng Zer Jun <engzerjun@gmail.com>

tempfork/gliderlabs/ssh/agent.go

@@ -2,8 +2,8 @@ package ssh
 
 import (
 	"io"
-	"io/ioutil"
 	"net"
+	"os"
 	"path"
 	"sync"
 
@@ -36,7 +36,7 @@ func AgentRequested(sess Session) bool {
 // NewAgentListener sets up a temporary Unix socket that can be communicated
 // to the session environment and used for forwarding connections.
 func NewAgentListener() (net.Listener, error) {
-	dir, err := ioutil.TempDir("", agentTempDir)
+	dir, err := os.MkdirTemp("", agentTempDir)
 	if err != nil {
 		return nil, err
 	}