Update WebRTC code version (2022-09-20T04:12:52).

Bug: None
Change-Id: I4087fb049bc3b29a39f9973ec11effdb0fa25b65
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/276002
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@{#38122}
diff --git a/call/version.cc b/call/version.cc
index 3142e1d..32c3dc6 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 2022-09-19T04:07:26";
+const char* const kSourceTimestamp = "WebRTC source stamp 2022-09-20T04:12:52";
 
 void LoadWebRTCVersionInRegister() {
   // Using volatile to instruct the compiler to not optimize `p` away even