Update WebRTC code version (2023-05-25T04:12:48).

Bug: None
Change-Id: I884d33da97ed03ab3a92f6a73475a9cc64a11420
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/306425
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@{#40137}
diff --git a/call/version.cc b/call/version.cc
index caaac84..6e4ac5a 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 2023-05-24T04:17:39";
+const char* const kSourceTimestamp = "WebRTC source stamp 2023-05-25T04:12:48";
 
 void LoadWebRTCVersionInRegister() {
   // Using volatile to instruct the compiler to not optimize `p` away even