Bump astro in /client in the npm-production group across 1 directory

Bumps the npm-production group with 1 update in the /client directory: [astro](https://github.com/withastro/astro/tree/HEAD/packages/astro).


Updates `astro` from 5.12.4 to 5.12.9
- [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@5.12.9/packages/astro)

---
updated-dependencies:
- dependency-name: astro
  dependency-version: 5.12.9
  dependency-type: direct:production
  update-type: version-update:semver-patch
  dependency-group: npm-production
...

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

Author: dependabot[bot]

client/package-lock.json

@@ -13,7 +13,7 @@
     "@astrojs/node": "^9.3.0",
     "@astrojs/svelte": "^7.1.0",
     "@tailwindcss/vite": "^4.1.11",
-    "astro": "^5.12.3",
+    "astro": "^5.12.9",
     "svelte": "^5.37.0",
     "typescript": "^5.8.3"
   },