Update WebRTC code version (2021-07-22T04:03:23).

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

Bug: None
Change-Id: Id0de096d61cd61b8083bd739ab134be536ad648a
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/226721
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@{#34522}
diff --git a/call/version.cc b/call/version.cc
index 084e1e5..ec37f50 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 2021-07-21T04:03:21";
+const char* const kSourceTimestamp = "WebRTC source stamp 2021-07-22T04:03:23";
 
 void LoadWebRTCVersionInRegister() {
   // Using volatile to instruct the compiler to not optimize `p` away even