Update WebRTC code version (2023-08-28T04:13:13).

Bug: None
Change-Id: Iff28f87cac9b8304a202305335f708d00dc938df
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/317846
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@{#40638}
diff --git a/call/version.cc b/call/version.cc
index 51cc1c0..c7cfcf7 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 2023-08-27T04:04:26";
+const char* const kSourceTimestamp = "WebRTC source stamp 2023-08-28T04:13:13";
 
 void LoadWebRTCVersionInRegister() {
   // Using volatile to instruct the compiler to not optimize `p` away even