Bump astro from 5.14.1 to 5.15.9 in /src

Bumps [astro](https://github.com/withastro/astro/tree/HEAD/packages/astro) from 5.14.1 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:development
...

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

src/package.json

@@ -13,7 +13,7 @@
     "@tailwindcss/typography": "^0.5.16",
     "@types/react": "^18.3.20",
     "@types/react-dom": "^18.3.6",
-    "astro": "^5.14.1",
+    "astro": "^5.15.9",
     "tailwindcss": "^3.4.17"
   },
   "dependencies": {