chore(deps): bump astro from 5.8.1 to 5.9.0 in the minor-updates group (#489)

Bumps the minor-updates group with 1 update: [astro](https://github.com/withastro/astro/tree/HEAD/packages/astro).


Updates `astro` from 5.8.1 to 5.9.0
- [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@5.9.0/packages/astro)

---
updated-dependencies:
- dependency-name: astro
  dependency-version: 5.9.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: minor-updates
...

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package.json

@@ -33,7 +33,7 @@
     "@iconify/svelte": "^4.2.0",
     "@swup/astro": "^1.6.0",
     "@tailwindcss/typography": "^0.5.16",
-    "astro": "5.8.1",
+    "astro": "5.9.1",
     "astro-expressive-code": "^0.41.2",
     "astro-icon": "^1.1.5",
     "hastscript": "^9.0.1",