[d8] Make myself an owner of d8

Change-Id: If22a3121f3fdaf0e67ecee267ea275b1bc79d617
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2039052Reviewed-by: Clemens Backes <clemensb@chromium.org>
Reviewed-by: Yang Guo <yangguo@chromium.org>
Commit-Queue: Ulan Degenbaev <ulan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#66203}

src/d8/OWNERS

 binji@chromium.org
 bmeurer@chromium.org
 clemensb@chromium.org
+ulan@chromium.org
 verwaest@chromium.org