internal/queue: downgrade ignore message to debug

Change the log message about ignoring a duplicate task from Info to
Debug to avoid cluttering the logs.

Change-Id: I08baadf10e731150cfd5a8be26d28f2598e02bda
Reviewed-on: https://go-review.googlesource.com/c/pkgsite/+/256763
Trust: Jonathan Amsterdam <jba@google.com>
Run-TryBot: Jonathan Amsterdam <jba@google.com>
TryBot-Result: kokoro <noreply+kokoro@google.com>
Reviewed-by: Julie Qiu <julie@golang.org>
diff --git a/internal/queue/queue.go b/internal/queue/queue.go
index 110c72a..64bbfae 100644
--- a/internal/queue/queue.go
+++ b/internal/queue/queue.go
@@ -130,7 +130,7 @@
 	enqueued = true
 	if _, err := q.client.CreateTask(ctx, req); err != nil {
 		if status.Code(err) == codes.AlreadyExists {
-			log.Infof(ctx, "ignoring duplicate task ID %s: %s@%s", req.Task.Name, modulePath, version)
+			log.Debugf(ctx, "ignoring duplicate task ID %s: %s@%s", req.Task.Name, modulePath, version)
 			enqueued = false
 		} else {
 			return false, fmt.Errorf("q.client.CreateTask(ctx, req): %v", err)