all: use Go 1.22 range-over-int

Updates #11058

Change-Id: I35e7ef9b90e83cac04ca93fd964ad00ed5b48430
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>

tstest/integration/vms/vms_test.go

@@ -321,7 +321,7 @@ func (h *Harness) setupSSHShell(t *testing.T, d Distro, ipm ipMapping) (*ssh.Cli
 	// don't use socket activation.
 	const maxRetries = 5
 	var working bool
-	for i := 0; i < maxRetries; i++ {
+	for range maxRetries {
 		cli, err := ssh.Dial("tcp", hostport, ccfg)
 		if err == nil {
 			working = true