Add sokcevic@google.com to owners

Change-Id: Iac0797ddb6331d5b07f9919932560519d78c640a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/tools/depot_tools/+/2226049Reviewed-by: Edward Lesmes <ehmaldonado@chromium.org>
Reviewed-by: Josip Sokcevic <sokcevic@google.com>
Auto-Submit: Edward Lesmes <ehmaldonado@chromium.org>
Commit-Queue: Edward Lesmes <ehmaldonado@chromium.org>

OWNERS

@@ -5,6 +5,7 @@ dpranke@chromium.org
 ehmaldonado@chromium.org
 ehmaldonado@google.com
 jochen@chromium.org
+sokcevic@google.com
 
 per-file ninja*=thakis@chromium.org
 per-file ninja*=scottmg@chromium.org