Update WebRTC code version (2021-12-12T04:04:39).

Bug: None
Change-Id: I52cbe2abe38735ce9e2016037da0a6b97a07cdfb
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/240983
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@{#35523}
diff --git a/call/version.cc b/call/version.cc
index ee61abe..7cf7900 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 2021-12-11T04:01:46";
+const char* const kSourceTimestamp = "WebRTC source stamp 2021-12-12T04:04:39";
 
 void LoadWebRTCVersionInRegister() {
   // Using volatile to instruct the compiler to not optimize `p` away even