Update WebRTC code version (2023-09-26T04:02:19).

Bug: None
Change-Id: Idfcc4d95fba64ffc75630315bebef51b3fcc7065
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/321542
Commit-Queue: webrtc-version-updater@webrtc-ci.iam.gserviceaccount.com <webrtc-version-updater@webrtc-ci.iam.gserviceaccount.com>
Bot-Commit: webrtc-version-updater@webrtc-ci.iam.gserviceaccount.com <webrtc-version-updater@webrtc-ci.iam.gserviceaccount.com>
Cr-Commit-Position: refs/heads/main@{#40808}
diff --git a/call/version.cc b/call/version.cc
index 4d1586d..5e3d773 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 2023-09-23T04:12:34";
+const char* const kSourceTimestamp = "WebRTC source stamp 2023-09-26T04:02:19";
 
 void LoadWebRTCVersionInRegister() {
   // Using volatile to instruct the compiler to not optimize `p` away even