Bump svelte from 5.53.0 to 5.53.6 in /docs (#844)

Bumps [svelte](https://github.com/sveltejs/svelte/tree/HEAD/packages/svelte) from 5.53.0 to 5.53.6.
- [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@5.53.6/packages/svelte)

---
updated-dependencies:
- dependency-name: svelte
  dependency-version: 5.53.6
  dependency-type: direct:production
...

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docs/package.json

@@ -21,7 +21,7 @@
     "astro": "^5.17.1",
     "sharp": "^0.34.5",
     "starlight-openapi": "^0.22.0",
-    "svelte": "^5.53.0",
+    "svelte": "^5.53.6",
     "tailwindcss": "^4.1.10",
     "typescript": "^5.9.3"
   }