Bump astro from 6.1.4 to 6.4.2

Bumps [astro](https://github.com/withastro/astro/tree/HEAD/packages/astro) from 6.1.4 to 6.4.2.
- [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@6.4.2/packages/astro)

---
updated-dependencies:
- dependency-name: astro
  dependency-version: 6.4.2
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

package.json

@@ -13,7 +13,7 @@
   "dependencies": {
     "@astrojs/rss": "^4.0.0",
     "@astrojs/sitemap": "^3.0.0",
-    "astro": "^6.1.3"
+    "astro": "^6.4.2"
   },
   "devDependencies": {
     "@astrojs/check": "^0.9.8",