swarm/network: downgrade fetcher unable to request log message severity (#17692)

swarm/network/fetcher.go

@@ -215,7 +215,7 @@ func (f *Fetcher) run(ctx context.Context, peers *sync.Map) {
 			var err error
 			sources, err = f.doRequest(ctx, gone, peers, sources)
 			if err != nil {
-				log.Warn("unable to request", "request addr", f.addr, "err", err)
+				log.Info("unable to request", "request addr", f.addr, "err", err)
 			}
 		}