Update WebRTC code version (2021-08-12T04:05:19).

TBR=webrtc-version-updater@webrtc-ci.iam.gserviceaccount.com,mbonadei@webrtc.org

Bug: None
Change-Id: I58469f5a177b3861f2f3d21c160f34b4f98d08bd
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/228470
Reviewed-by: 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/master@{#34730}
diff --git a/call/version.cc b/call/version.cc
index b3d7cfd..a0869f0 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 2021-08-11T04:05:19";
+const char* const kSourceTimestamp = "WebRTC source stamp 2021-08-12T04:05:19";
 
 void LoadWebRTCVersionInRegister() {
   // Using volatile to instruct the compiler to not optimize `p` away even