Bump astro from 5.16.6 to 6.0.8

Bumps [astro](https://github.com/withastro/astro/tree/HEAD/packages/astro) from 5.16.6 to 6.0.8.
- [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@6.0.8/packages/astro)

---
updated-dependencies:
- dependency-name: astro
  dependency-version: 6.0.8
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

packages/astro-tunnel/package.json

@@ -34,7 +34,7 @@
   "devDependencies": {
     "@types/node": "24.10.1",
     "@typescript/native-preview": "7.0.0-dev.20251203.1",
-    "astro": "5.16.6",
+    "astro": "6.0.8",
     "tsdown": "0.14.0"
   },
   "peerDependencies": {

playground/package.json

@@ -11,7 +11,7 @@
     "astro": "astro"
   },
   "dependencies": {
-    "astro": "5.16.6",
+    "astro": "6.0.8",
     "astro-tunnel": "workspace:*",
     "@astrojs/check": "0.9.6",
     "typescript": "5.9.3"