all: use Go 1.22 range-over-int

Updates #11058

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

net/sockstats/sockstats_tsgo_test.go

@@ -62,7 +62,7 @@ func TestRadioMonitor(t *testing.T) {
 			"400 iterations: 2 sec active, 1 min idle",
 			func(tt *testTime, rm *radioMonitor) {
 				// 400 iterations to ensure values loop back around rm.usage array
-				for i := 0; i < 400; i++ {
+				for range 400 {
 					rm.active()
 					tt.Add(1 * time.Second)
 					rm.active()