Adding vahl@ as owner to speed up merge handling

Change-Id: Ia92047d3e23b4180172c9d53c0b0bca12a856a04
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3734812Reviewed-by: Hannes Payer <hpayer@chromium.org>
Auto-Submit: Lutz Vahl <vahl@chromium.org>
Commit-Queue: Hannes Payer <hpayer@chromium.org>
Cr-Commit-Position: refs/heads/main@{#81484}

ENG_REVIEW_OWNERS

@@ -6,3 +6,4 @@ adamk@chromium.org
 danno@chromium.org
 hpayer@chromium.org
 verwaest@chromium.org
+vahl@chromium.org