all: use Go 1.22 range-over-int

Updates #11058

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

logtail/filch/filch_test.go

@@ -75,11 +75,11 @@ func TestDropOldLogs(t *testing.T) {
 			f := newFilchTest(t, filePrefix, Options{ReplaceStderr: false, MaxFileSize: 1000})
 			defer f.close(t)
 			// Make filch rotate the logs 3 times
-			for i := 0; i < tc.write; i++ {
+			for range tc.write {
 				f.write(t, line1)
 			}
 			// We should only be able to read the last 150 lines
-			for i := 0; i < tc.read; i++ {
+			for i := range tc.read {
 				f.read(t, line1)
 				if t.Failed() {
 					t.Logf("could only read %d lines", i)

logtail/logtail_test.go

@@ -77,7 +77,7 @@ func NewLogtailTestHarness(t *testing.T) (*LogtailTestServer, *Logger) {
 func TestDrainPendingMessages(t *testing.T) {
 	ts, l := NewLogtailTestHarness(t)
 
-	for i := 0; i < logLines; i++ {
+	for range logLines {
 		l.Write([]byte("log line"))
 	}
 
@@ -540,7 +540,7 @@ func BenchmarkWriteText(b *testing.B) {
 	l.clock = tstime.StdClock{}
 	l.buffer = discardBuffer{}
 	b.ReportAllocs()
-	for i := 0; i < b.N; i++ {
+	for range b.N {
 		must.Get(l.Write(testdataTextLog))
 	}
 }
@@ -550,7 +550,7 @@ func BenchmarkWriteJSON(b *testing.B) {
 	l.clock = tstime.StdClock{}
 	l.buffer = discardBuffer{}
 	b.ReportAllocs()
-	for i := 0; i < b.N; i++ {
+	for range b.N {
 		must.Get(l.Write(testdataJSONLog))
 	}
 }