all: use Go 1.22 range-over-int

Updates #11058

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

net/interfaces/interfaces_darwin_test.go

@@ -103,7 +103,7 @@ func likelyHomeRouterIPDarwinExec() (ret netip.Addr, netif string, ok bool) {
 
 func TestFetchRoutingTable(t *testing.T) {
 	// Issue 1345: this used to be flaky on darwin.
-	for i := 0; i < 20; i++ {
+	for range 20 {
 		_, err := fetchRoutingTable()
 		if err != nil {
 			t.Fatal(err)

net/interfaces/interfaces_linux_test.go

@@ -97,7 +97,7 @@ func TestAwsAppRunnerDefaultRouteInterface(t *testing.T) {
 
 func BenchmarkDefaultRouteInterface(b *testing.B) {
 	b.ReportAllocs()
-	for i := 0; i < b.N; i++ {
+	for range b.N {
 		if _, err := DefaultRouteInterface(); err != nil {
 			b.Fatal(err)
 		}

net/interfaces/interfaces_windows_test.go

@@ -7,7 +7,7 @@ import "testing"
 
 func BenchmarkGetPACWindows(b *testing.B) {
 	b.ReportAllocs()
-	for i := 0; i < b.N; i++ {
+	for i := range b.N {
 		v := getPACWindows()
 		if i == 0 {
 			b.Logf("Got: %q", v)