Update WebRTC code version (2026-09-30T04:07:46).

Bug: None
Change-Id: Id13faa84226d601827615f2e16d79c82c95d4863
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/506480
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@{#48758}

call/version.cc

diff --git a/call/version.cc b/call/version.cc
index e546b4d..96e342f 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 2026-09-29T04:08:07";
+const char* const kSourceTimestamp = "WebRTC source stamp 2026-09-30T04:07:46";
 
 void LoadWebRTCVersionInRegister() {
   // Using volatile to instruct the compiler to not optimize `p` away even