TaskQueuePacedSender: Process packets after outstanding data update

Bug: webrtc:10809
Change-Id: I31785c529d331891830777c93d7067f96580ea39
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/238967
Reviewed-by: Erik Språng <sprang@webrtc.org>
Reviewed-by: Henrik Boström <hbos@webrtc.org>
Reviewed-by: Philip Eliasson <philipel@webrtc.org>
Commit-Queue: Erik Språng <sprang@webrtc.org>
Cr-Commit-Position: refs/heads/main@{#35450}

modules/pacing/task_queue_paced_sender.cc

@@ -114,6 +114,7 @@ void TaskQueuePacedSender::UpdateOutstandingData(DataSize outstanding_data) {
     // Fast path since this can be called once per sent packet while on the
     // task queue.
     pacing_controller_.UpdateOutstandingData(outstanding_data);
+    MaybeProcessPackets(Timestamp::MinusInfinity());
     return;
   }