chore(deps): bump astro from 5.13.3 to 5.15.1

Bumps [astro](https://github.com/withastro/astro/tree/HEAD/packages/astro) from 5.13.3 to 5.15.1.
- [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@5.15.1/packages/astro)

---
updated-dependencies:
- dependency-name: astro
  dependency-version: 5.15.1
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

package.json

@@ -41,7 +41,7 @@
     "@astrojs/sitemap": "3.5.1",
     "@lucide/astro": "0.541.0",
     "@tailwindcss/vite": "4.1.12",
-    "astro": "5.13.3",
+    "astro": "5.15.1",
     "astro-expressive-code": "0.41.3",
     "flexsearch": "0.8.205",
     "gray-matter": "4.0.3",