Update WebRTC code version (2022-01-21T04:03:17).

Bug: None
Change-Id: I8f533101f5f281d64e76e866d61f8a2225abe8b5
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/248120
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@{#35756}

call/version.cc

diff --git a/call/version.cc b/call/version.cc
index b3698cd..a53b6bf 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 2022-01-19T04:05:25";
+const char* const kSourceTimestamp = "WebRTC source stamp 2022-01-21T04:03:17";
 
 void LoadWebRTCVersionInRegister() {
   // Using volatile to instruct the compiler to not optimize `p` away even