Update WebRTC code version (2021-12-09T04:05:04).

Bug: None
Change-Id: I5a6ca60f80741bc052a9c58b1054dfd2fbd2f982
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/240443
Bot-Commit: webrtc-version-updater@webrtc-ci.iam.gserviceaccount.com <webrtc-version-updater@webrtc-ci.iam.gserviceaccount.com>
Commit-Queue: webrtc-version-updater@webrtc-ci.iam.gserviceaccount.com <webrtc-version-updater@webrtc-ci.iam.gserviceaccount.com>
Cr-Commit-Position: refs/heads/main@{#35506}
diff --git a/call/version.cc b/call/version.cc
index 51cdb97..f8147c9 100644
--- a/call/version.cc
+++ b/call/version.cc
@@ -13,7 +13,7 @@
 namespace webrtc {
 
 // The timestamp is always in UTC.
-const char* const kSourceTimestamp = "WebRTC source stamp 2021-12-08T04:04:49";
+const char* const kSourceTimestamp = "WebRTC source stamp 2021-12-09T04:05:04";
 
 void LoadWebRTCVersionInRegister() {
   // Using volatile to instruct the compiler to not optimize `p` away even