deps: patch V8 to 6.6.346.31
Refs: https://github.com/v8/v8/compare/6.6.346.27...6.6.346.31
note: https://github.com/v8/v8/commit/76cab5ff786bea157a6931296924384a2242da93 has already landed on master
Do not update/delete: Banner broadcast message test data
Do not update/delete: Notification broadcast message test data
Refs: https://github.com/v8/v8/compare/6.6.346.27...6.6.346.31
note: https://github.com/v8/v8/commit/76cab5ff786bea157a6931296924384a2242da93 has already landed on master