chore(deps-dev): bump astro from 1.6.10 to 6.4.6

Bumps [astro](https://github.com/withastro/astro/tree/HEAD/packages/astro) from 1.6.10 to 6.4.6.
- [Release notes](https://github.com/withastro/astro/releases)
- [Changelog](https://github.com/withastro/astro/blob/main/packages/astro/CHANGELOG-v1.md)
- [Commits](https://github.com/withastro/astro/commits/astro@6.4.6/packages/astro)

---
updated-dependencies:
- dependency-name: astro
  dependency-version: 5.15.9
  dependency-type: direct:development
...

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

Author: dependabot[bot]

examples/astro-solid/package.json

@@ -9,7 +9,7 @@
     "@babel/core": "^7.23.5",
     "@linaria/core": "workspace:^",
     "@wyw-in-js/vite": "2.1.0",
-    "astro": "^1.6.10",
+    "astro": "^6.4.6",
     "solid-js": "^1.9.4",
     "vite": "^3",
     "vite-plugin-inspect": "^0.7.33"