all: use Go 1.22 range-over-int

Updates #11058

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

tstest/integration/vms/vm_setup_test.go

@@ -50,7 +50,7 @@ func (vm *vmInstance) running() bool {
 
 func (vm *vmInstance) waitStartup(t *testing.T) {
 	t.Helper()
-	for i := 0; i < 100; i++ {
+	for range 100 {
 		if vm.running() {
 			break
 		}