go.mod: move from github.com/gliderlabs/ssh to github.com/tailscale/ssh

Updates #4146

Signed-off-by: Maisem Ali <maisem@tailscale.com>

ssh/tailssh/incubator.go

@@ -27,7 +27,7 @@ import (
 	"syscall"
 
 	"github.com/creack/pty"
-	"github.com/gliderlabs/ssh"
+	"github.com/tailscale/ssh"
 	"github.com/u-root/u-root/pkg/termios"
 	"golang.org/x/sys/unix"
 	"tailscale.com/cmd/tailscaled/childproc"

ssh/tailssh/tailssh.go

@@ -24,7 +24,7 @@ import (
 	"sync"
 	"time"
 
-	"github.com/gliderlabs/ssh"
+	"github.com/tailscale/ssh"
 	"inet.af/netaddr"
 	"tailscale.com/envknob"
 	"tailscale.com/ipn/ipnlocal"

ssh/tailssh/tailssh_test.go

@@ -20,7 +20,7 @@ import (
 	"testing"
 	"time"
 
-	"github.com/gliderlabs/ssh"
+	"github.com/tailscale/ssh"
 	"inet.af/netaddr"
 	"tailscale.com/ipn/ipnlocal"
 	"tailscale.com/ipn/store/mem"