Update WebRTC code version (2021-12-26T04:03:42).

Bug: None
Change-Id: I08fd5831397c031f816d22217c0bd59e479349ad
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/243121
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@{#35582}
diff --git a/call/version.cc b/call/version.cc
index 42593f4..578b0ac 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 2021-12-25T04:03:43";
+const char* const kSourceTimestamp = "WebRTC source stamp 2021-12-26T04:03:42";
 
 void LoadWebRTCVersionInRegister() {
   // Using volatile to instruct the compiler to not optimize `p` away even