Update WebRTC code version (2021-12-11T04:01:46).

Bug: None
Change-Id: I82b0e6c9b53fb74915ab34221e879d0f46ab41ae
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/240723
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@{#35521}

call/version.cc

diff --git a/call/version.cc b/call/version.cc
index 3f996f6..ee61abe 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 2021-12-10T04:04:39";
+const char* const kSourceTimestamp = "WebRTC source stamp 2021-12-11T04:01:46";
 
 void LoadWebRTCVersionInRegister() {
   // Using volatile to instruct the compiler to not optimize `p` away even