Bump astro from 5.15.9 to 5.18.1

Bumps [astro](https://github.com/withastro/astro/tree/HEAD/packages/astro) from 5.15.9 to 5.18.1.
- [Release notes](https://github.com/withastro/astro/releases)
- [Changelog](https://github.com/withastro/astro/blob/astro@5.18.1/packages/astro/CHANGELOG.md)
- [Commits](https://github.com/withastro/astro/commits/astro@5.18.1/packages/astro)

---
updated-dependencies:
- dependency-name: astro
  dependency-version: 5.18.1
  dependency-type: direct:production
...

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

Author: dependabot[bot]

package.json

@@ -37,7 +37,7 @@
     "@trpc/client": "11.5.0",
     "@trpc/server": "11.8.0",
     "anchorme": "^3.0.8",
-    "astro": "5.15.9",
+    "astro": "5.18.1",
     "solid-js": "^1.9.9",
     "solid-markdown": "^2.0.14",
     "tsx": "^4.20.4",