Add juberti@ to webrtc root owners

It's useful to have someone in PST timezone with root approval.

Bug: webrtc:10638
Change-Id: I9453c6bca3b77879c0c893bff8ca1abb6db5ab2a
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/137182
Reviewed-by: Justin Uberti <juberti@google.com>
Reviewed-by: Stefan Holmer <stefan@webrtc.org>
Reviewed-by: Magnus Flodman <mflodman@webrtc.org>
Commit-Queue: Anton Sukhanov <sukhanov@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#27977}
diff --git a/OWNERS b/OWNERS
index 998b3c4..ef565af 100644
--- a/OWNERS
+++ b/OWNERS
@@ -1,4 +1,5 @@
 henrika@webrtc.org
+juberti@webrtc.org
 kwiberg@webrtc.org
 mflodman@webrtc.org
 phoglund@webrtc.org