Fix Authors Check presubmit.

Adding the account that performs the auto-update of the WebRTC version
string.

No-Presubmit: True
No-Try: True
Bug: webrtc:12159
Change-Id: Ie24d0de30a08bb5e21955a90059af982d019110c
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/197803
Commit-Queue: Mirko Bonadei <mbonadei@webrtc.org>
Reviewed-by: Tommi <tommi@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#32830}
diff --git a/PRESUBMIT.py b/PRESUBMIT.py
index 091037c..12f87d7 100755
--- a/PRESUBMIT.py
+++ b/PRESUBMIT.py
@@ -975,7 +975,8 @@
             input_api,
             output_api,
             bot_allowlist=[
-                'chromium-webrtc-autoroll@webrtc-ci.iam.gserviceaccount.com'
+                'chromium-webrtc-autoroll@webrtc-ci.iam.gserviceaccount.com',
+                'webrtc-version-updater@webrtc-ci.iam.gserviceaccount.com',
             ]))
     results.extend(
         input_api.canned_checks.CheckChangeTodoHasOwner(