Update WebRTC code version (2025-08-07T04:06:30).

Bug: None
Change-Id: If51d277d988d1aece45b4c72cae44a4271db04d5
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/403502
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@{#45303}

call/version.cc

diff --git a/call/version.cc b/call/version.cc
index dcb0cd7..97a8330 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 2025-08-04T04:06:00";
+const char* const kSourceTimestamp = "WebRTC source stamp 2025-08-07T04:06:30";
 
 void LoadWebRTCVersionInRegister() {
   // Using volatile to instruct the compiler to not optimize `p` away even