Bump astro from 5.18.1 to 6.1.6

Bumps [astro](https://github.com/withastro/astro/tree/HEAD/packages/astro) from 5.18.1 to 6.1.6.
- [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@6.1.6/packages/astro)

---
updated-dependencies:
- dependency-name: astro
  dependency-version: 6.1.6
  dependency-type: direct:development
...

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

package.json

@@ -18,7 +18,7 @@
     "@fontsource-variable/jost": "^5.2.8",
     "@fontsource-variable/playfair-display": "^5.2.8",
     "@iconify-json/ion": "^1.2.7",
-    "astro": "^5.18.1",
+    "astro": "^6.1.6",
     "fuse.js": "^7.3.0",
     "mdast-util-to-string": "^4.0.0",
     "reading-time": "^1.5.0",