Update WebRTC code version (2021-06-13T04:02:18).

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

Bug: None
Change-Id: Ib0046c3942117c9ab48ab9233e7c4b64b983c8f9
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/222260
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@{#34275}
diff --git a/call/version.cc b/call/version.cc
index 810db4e..e16eab1 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 2021-06-10T04:05:52";
+const char* const kSourceTimestamp = "WebRTC source stamp 2021-06-13T04:02:18";
 
 void LoadWebRTCVersionInRegister() {
   // Using volatile to instruct the compiler to not optimize `p` away even