build(deps-dev): bump astro from 4.5.18 to 4.16.1 in /landing

Bumps [astro](https://github.com/withastro/astro/tree/HEAD/packages/astro) from 4.5.18 to 4.16.1.
- [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@4.16.1/packages/astro)

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

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

landing/package.json

@@ -15,7 +15,7 @@
 		"@astrojs/node": "^8.2.0",
 		"@astrojs/solid-js": "^4.0.1",
 		"@babel/core": "^7.23.9",
-		"astro": "^4.3.5",
+		"astro": "^4.16.1",
 		"polka": "^0.5.2",
 		"prettier": "^3.2.5",
 		"prettier-plugin-astro": "^0.13.0",