Update WebRTC code version (2022-06-28T04:05:24).

Bug: None
Change-Id: Ib70f531d12c8a74505d547ec26ee68c993828f17
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/267026
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@{#37347}

call/version.cc

diff --git a/call/version.cc b/call/version.cc
index 49c4753..6f68f10 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 2022-06-27T04:02:27";
+const char* const kSourceTimestamp = "WebRTC source stamp 2022-06-28T04:05:24";
 
 void LoadWebRTCVersionInRegister() {
   // Using volatile to instruct the compiler to not optimize `p` away even