fix: Await verify function (#629)

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

<!-- CURSOR_SUMMARY -->
---

> [!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.
> 
> <sup>Written by [Cursor
Bugbot](https://cursor.com/dashboard?tab=bugbot) for commit
03e0579. This will update automatically
on new commits. Configure
[here](https://cursor.com/dashboard?tab=bugbot).</sup>
<!-- /CURSOR_SUMMARY -->

Author: FrederikBolding

gatsby-node.ts

@@ -138,7 +138,7 @@ async function getRegistry() {
     headers: HEADERS,
   }).then(async (response) => response.json());
 
-  const isRegistryValid = verify({
+  const isRegistryValid = await verify({
     registry: rawRegistry,
     signature,
     publicKey: PUBLIC_KEY,