Bump svelte in /samples/rag-document-qa-svelte/frontend (#1611)

Bumps [svelte](https://github.com/sveltejs/svelte/tree/HEAD/packages/svelte) from 5.55.6 to 5.55.7.
- [Release notes](https://github.com/sveltejs/svelte/releases)
- [Changelog](https://github.com/sveltejs/svelte/blob/main/packages/svelte/CHANGELOG.md)
- [Commits](https://github.com/sveltejs/svelte/commits/svelte@5.55.7/packages/svelte)

---
updated-dependencies:
- dependency-name: svelte
  dependency-version: 5.55.7
  dependency-type: direct:development
...

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samples/rag-document-qa-svelte/frontend/package-lock.json

@@ -10,7 +10,7 @@
   },
   "devDependencies": {
     "@sveltejs/vite-plugin-svelte": "^7.1.2",
-    "svelte": "^5.55.6",
+    "svelte": "^5.55.7",
     "vite": "^8.0.13"
   }
 }