all: use Go 1.22 range-over-int

Updates #11058

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

safesocket/pipe_windows_test.go

@@ -99,7 +99,7 @@ func TestExpectedWindowsTypes(t *testing.T) {
 		errs <- nil
 	}()
 
-	for i := 0; i < 2; i++ {
+	for range 2 {
 		if err := <-errs; err != nil {
 			t.Fatal(err)
 		}