Update WebRTC code version (2024-04-21T04:01:40).

Bug: None
Change-Id: I4ba2aee6d7412b0d1f72672303400bf9de3cb664
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/348420
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@{#42131}
diff --git a/call/version.cc b/call/version.cc
index e2e7d1f..2ba7694 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 2024-04-20T04:03:45";
+const char* const kSourceTimestamp = "WebRTC source stamp 2024-04-21T04:01:40";
 
 void LoadWebRTCVersionInRegister() {
   // Using volatile to instruct the compiler to not optimize `p` away even