all: use Go 1.22 range-over-int

Updates #11058

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

tstime/jitter_test.go

@@ -14,7 +14,7 @@ func TestRandomDurationBetween(t *testing.T) {
 	}
 	const min = 1 * time.Second
 	const max = 10 * time.Second
-	for i := 0; i < 500; i++ {
+	for range 500 {
 		if got := RandomDurationBetween(min, max); got < min || got >= max {
 			t.Fatalf("%v (%d) out of range", got, got)
 		}

tstime/mono/mono_test.go

@@ -50,14 +50,14 @@ func TestJSONRoundtrip(t *testing.T) {
 
 func BenchmarkMonoNow(b *testing.B) {
 	b.ReportAllocs()
-	for i := 0; i < b.N; i++ {
+	for range b.N {
 		Now()
 	}
 }
 
 func BenchmarkTimeNow(b *testing.B) {
 	b.ReportAllocs()
-	for i := 0; i < b.N; i++ {
+	for range b.N {
 		time.Now()
 	}
 }

tstime/rate/rate_test.go

@@ -7,8 +7,6 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-//go:build go1.7
-
 package rate
 
 import (
@@ -138,7 +136,7 @@ func TestSimultaneousRequests(t *testing.T) {
 	}
 
 	wg.Add(numRequests)
-	for i := 0; i < numRequests; i++ {
+	for range numRequests {
 		go f()
 	}
 	wg.Wait()

tstime/rate/value_test.go

@@ -43,7 +43,7 @@ func TestValue(t *testing.T) {
 		c := qt.New(t)
 		var v Value
 		var now mono.Time
-		for i := 0; i < numStep; i++ {
+		for range numStep {
 			v.addNow(now, float64(step))
 			now += step
 		}
@@ -232,7 +232,7 @@ func stats(fs []float64) (mean, stddev float64) {
 func BenchmarkValue(b *testing.B) {
 	b.ReportAllocs()
 	v := Value{HalfLife: time.Second}
-	for i := 0; i < b.N; i++ {
+	for range b.N {
 		v.Add(1)
 	}
 }