fix: Await verify function

[FrederikBolding]

After bumping snaps-registry, verify needs to be awaited.

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Note

Low Risk
Low risk: this is a one-line build-time fix to correctly await verify, affecting only registry signature validation flow during Gatsby sourcing.

Overview
Fixes registry signature validation during the Gatsby build by awaiting the now-async verify call before asserting validity.

This ensures the Invalid registry signature check uses the resolved boolean result rather than a pending Promise after the snaps-registry dependency update.

^{Written by Cursor Bugbot for commit 03e0579. This will update automatically on new commits. Configure here.}

[github-actions]

Commit 03e05797020286176f907887d6eb608dd055f4ac successfully pushed to staging website:

https://metamask.github.io/snaps-directory-staging/pr/629/