build(deps): bump astro from 5.16.6 to 6.1.6

Bumps [astro](https://github.com/withastro/astro/tree/HEAD/packages/astro) from 5.16.6 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:production
...

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

Author: dependabot[bot]

package.json

@@ -17,7 +17,7 @@
     "@astrojs/sitemap": "^3.6.0",
     "@resvg/resvg-js": "^2.6.2",
     "@tailwindcss/vite": "^4.1.18",
-    "astro": "^5.16.6",
+    "astro": "^6.1.6",
     "dayjs": "^1.11.19",
     "lodash.kebabcase": "^4.1.1",
     "remark-collapse": "^0.1.2",