Following change in https://github.com/WebAssembly/stringref/pull/22.

Bug: v8:12868
Change-Id: Ic7728bff5d03ab547cb26ff41d6966f95bfb6b62
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3717986
Commit-Queue: Andy Wingo <wingo@igalia.com>
Reviewed-by: Jakob Kummerow <jkummerow@chromium.org>
Cr-Commit-Position: refs/heads/main@{#81308}