"Downloader queue stats" is now provided once per minute (#21455)

* "Downloader queue stats" is now a DEBUG information

I think this info is more a DEBUG related information then an INFO. If it must remains an INFO, maybe it can be slow down to one time every 5 minutes or so.

* Update queue.go

"Downloader queue stats" information is now provided once every minute instead of once every 10 seconds.

eth/downloader/queue.go

@@ -382,7 +382,7 @@ func (q *queue) Results(block bool) []*fetchResult {
 	throttleThreshold = q.resultCache.SetThrottleThreshold(throttleThreshold)
 
 	// Log some info at certain times
-	if time.Since(q.lastStatLog) > 10*time.Second {
+	if time.Since(q.lastStatLog) > 60*time.Second {
 		q.lastStatLog = time.Now()
 		info := q.Stats()
 		info = append(info, "throttle", throttleThreshold)