Bump astro from 5.14.4 to 5.15.9

Bumps [astro](https://github.com/withastro/astro/tree/HEAD/packages/astro) from 5.14.4 to 5.15.9.
- [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@5.15.9/packages/astro)

---
updated-dependencies:
- dependency-name: astro
  dependency-version: 5.15.9
  dependency-type: direct:production
...

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Author: dependabot[bot]

package.json

@@ -15,7 +15,7 @@
     "@tailwindcss/vite": "^4.1.14",
     "@types/react": "^19.2.2",
     "@types/react-dom": "^19.2.1",
-    "astro": "^5.14.4",
+    "astro": "^5.15.9",
     "astro-relative-links": "^0.4.2",
     "autoprefixer": "^10.4.21",
     "cssnano": "^7.1.1",