chore(deps): bump astro from 5.16.3 to 5.16.4

Bumps [astro](https://github.com/withastro/astro/tree/HEAD/packages/astro) from 5.16.3 to 5.16.4.
- [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@5.16.4/packages/astro)

---
updated-dependencies:
- dependency-name: astro
  dependency-version: 5.16.4
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

Author: dependabot[bot]

package.json

@@ -22,7 +22,7 @@
     "@astrojs/node": "^9.5.1",
     "@astrojs/sitemap": "^3.6.0",
     "@tailwindcss/vite": "^4.1.17",
-    "astro": "^5.16.3",
+    "astro": "^5.16.4",
     "express": "^5.2.1",
     "katex": "^0.16.25",
     "mdast-util-to-string": "^4.0.0",