Bump astro from 6.1.2 to 6.4.6 in /front

Bumps [astro](https://github.com/withastro/astro/tree/HEAD/packages/astro) from 6.1.2 to 6.4.6.
- [Release notes](https://github.com/withastro/astro/releases)
- [Changelog](https://github.com/withastro/astro/blob/main/packages/astro/CHANGELOG.md)
- [Commits](https://github.com/withastro/astro/commits/astro@6.4.6/packages/astro)

---
updated-dependencies:
- dependency-name: astro
  dependency-version: 6.4.6
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <support@github.com>

front/package.json

@@ -15,7 +15,7 @@
     "@lucide/svelte": "^1.7.0",
     "@tailwindcss/vite": "^4.2.1",
     "ansi_up": "^6.0.6",
-    "astro": "6.1.2",
+    "astro": "6.4.6",
     "dompurify": "^3.3.3",
     "js-yaml": "^4.1.1",
     "remark-github-blockquote-alert": "^2.1.0",