Add syg@chromium.org as DEPS owner for test262 rolls

NOTRY=true

Bug: v8:7834
Change-Id: I84bd68dd6e94a882a1c20075b9b23ba08dab4136
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1801257
Commit-Queue: Shu-yu Guo <syg@chromium.org>
Reviewed-by: Hannes Payer <hpayer@chromium.org>
Cr-Commit-Position: refs/heads/master@{#63853}

OWNERS

@@ -16,6 +16,7 @@ per-file BUILD.gn=file:COMMON_OWNERS
 per-file DEPS=file:INFRA_OWNERS
 # For Test262 rolls.
 per-file DEPS=mathias@chromium.org
+per-file DEPS=syg@chromium.org
 per-file PRESUBMIT.py=file:INFRA_OWNERS
 per-file codereview.settings=file:INFRA_OWNERS