Bump astro from 5.1.8 to 5.1.9

Bumps [astro](https://github.com/withastro/astro/tree/HEAD/packages/astro) from 5.1.8 to 5.1.9.
- [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@5.1.9/packages/astro)

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

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

package.json

@@ -16,7 +16,7 @@
     "@astrojs/check": "^0.9.4",
     "@astrojs/rss": "^4.0.9",
     "@astrojs/sitemap": "^3.2.1",
-    "astro": "^5.0.0",
+    "astro": "^5.1.9",
     "autoprefixer": "^10.4.20",
     "cssnano": "^7.0.6",
     "cssnano-preset-advanced": "^7.0.6",