Change logging severity to LS_VERBOSE for `RenderingTracker::OnDecodableFrameTimeout`

This log line triggers every 10s whenever the video stream has been
deregistered.

Bug: b/384950328
Change-Id: I124746346c9f0a27f0319454c8c7cc6ca7694c67
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/448281
Auto-Submit: Rasmus Brandt <brandtr@webrtc.org>
Commit-Queue: Rasmus Brandt <brandtr@webrtc.org>
Reviewed-by: Åsa Persson <asapersson@webrtc.org>
Cr-Commit-Position: refs/heads/main@{#46874}

video/timing/simulator/rendering_tracker.cc

diff --git a/video/timing/simulator/rendering_tracker.cc b/video/timing/simulator/rendering_tracker.cc
index 86ccb85..9741c5b 100644
--- a/video/timing/simulator/rendering_tracker.cc
+++ b/video/timing/simulator/rendering_tracker.cc
@@ -158,7 +158,10 @@
 
 void RenderingTracker::OnDecodableFrameTimeout(TimeDelta wait_time) {
   RTC_DCHECK_RUN_ON(&sequence_checker_);
-  RTC_LOG(LS_WARNING) << "VideoStreamBufferController timed out after wait_ms="
+  // Log as verbose because this timeout will periodically trigger when the
+  // stream has been deregistered. Unfortunately there is no log event for the
+  // deregistration, so the simulator will keep expecting packets forever.
+  RTC_LOG(LS_VERBOSE) << "VideoStreamBufferController timed out after wait_ms="
                       << wait_time << " on ssrc=" << config_.ssrc
                       << " (simulated_ts=" << env_.clock().CurrentTime() << ")";
   // TODO: b/423646186 - Consider adding this as a callback event.